diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 407d0eb..2c2e3eb 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -19,6 +19,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v1
       with:
@@ -26,7 +28,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install flake8 pytest
+        pip install flake8 pytest tox tox-gh-actions
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |
@@ -34,6 +36,8 @@ jobs:
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
-    - name: Test with pytest
+    - name: Test with tox
       run: |
         tox
+      env:
+        ESCPOS_CAPABILITIES_FILE: /home/runner/work/python-escpos/python-escpos/capabilities-data/dist/capabilities.json
diff --git a/.gitignore b/.gitignore
index f8415e3..ba41934 100644
--- a/.gitignore
+++ b/.gitignore
@@ -29,3 +29,6 @@ test/test-cli-output/
 *.swp
 *.swn
 *.swo
+
+# vscode
+.vscode/settings.json
diff --git a/.travis.yml b/.travis.yml
index 3ea9ff5..39b238e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: python
 sudo: false
 cache: pip
-dist: xenial
+dist: bionic
 git:
   depth: 100000
 addons:
@@ -33,27 +33,23 @@ matrix:
       env: TOXENV=py35
     - python: 3.6
       env: TOXENV=py36
-    - python: 3.6-dev
-      env: TOXENV=py36
     - python: 3.7
       env: TOXENV=py37
     - python: 3.7-dev
       env: TOXENV=py37
+    - python: 3.8
+      env: TOXENV=py38
     - python: 3.8-dev
       env: TOXENV=py38
     - python: nightly
       env: TOXENV=py38
-    - python: pypy
-      env: TOXENV=pypy
     - python: pypy3
       env: TOXENV=pypy3
-    - python: 3.7
+    - python: 3.8
       env: TOXENV=docs
-    - python: 3.7
+    - python: 3.8
       env: TOXENV=flake8
   allow_failures:
-    - python: 2.7
-    - python: 3.6-dev
     - python: 3.7-dev
     - python: 3.8-dev
     - python: nightly
@@ -82,4 +78,4 @@ deploy:
       tags: true
       repo: python-escpos/python-escpos
       branch: master
-      condition: $TRAVIS_PYTHON_VERSION = "3.7"
+      condition: $TRAVIS_PYTHON_VERSION = "3.8"
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..d4f4af7
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,16 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "test with tox",
+            "type": "shell",
+            "command": "tox",
+            "group": {
+                "kind": "test",
+                "isDefault": true
+              }
+        }
+    ]
+}
\ No newline at end of file
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index d823f07..6360a69 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,10 +1,35 @@
 *********
 Changelog
 *********
+2020-05-09 - Version 3.0a7 - "No Fixed Abode"
+---------------------------------------------
+This release is the eight alpha release of the new version 3.0.
+Please be aware that the API is subject to change until v3.0
+is released.
+
+This release also marks the point at which the project transitioned
+to having only a master-branch (and not an additional development branch).
+
+changes
+^^^^^^^
+- add Exception for NotImplementedError in detach_kernel_driver
+- update installation information
+- update and improve documentation
+- add error handling to image centering flag
+- update and fix tox and CI environment, preparing drop of support for Python 2
+
+contributors
+^^^^^^^^^^^^
+- Alexander Bougakov
+- Brian
+- Yaisel Hurtado
+- Maximilan Wagenbach
+- Patrick Kanzler
+
 2019-06-19 - Version 3.0a6 - "Mistake not..."
 ---------------------------------------------
 This release is the seventh alpha release of the new version 3.0.
-Please be aware the the API is subject to change until v3.0 is
+Please be aware that the API is subject to change until v3.0 is
 released.
 
 changes
diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index d249035..dd0bb9b 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -37,12 +37,9 @@ Apart from that the travis-log and the check by Landscape will provide you with
 
 GIT
 ^^^
-The master-branch contains code that has been released to PyPi. A release is marked with a tag
-corresponding to the version. Issues are closed when they have been resolved in the development-branch.
-
-When you have a change to make, begin by creating a new branch from the HEAD of `python-escpos/development`.
-Name your branch to indicate what you are trying to achieve. Good branch names might
-be `improve/text-handling`, `feature/enable-color-printing`.
+The master-branch contains the main development of the project. A release to PyPi is marked with a tag
+corresponding to the version. Issues are closed when they have been resolved by merging into the master-branch.
+When you have a change to make, begin by creating a new branch from the HEAD of `python-escpos/master`.
 
 Please try to group your commits into logical units. If you need to tidy up your branch, you can make use of a
 git feature called an 'interactive rebase' before making a pull request. A small, self-contained change-set is
diff --git a/MANIFEST.in b/MANIFEST.in
index f1666ca..d8e439a 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -4,6 +4,7 @@ include LICENSE
 include INSTALL
 include tox.ini
 include capabilities-data/dist/capabilities.json
+include src/escpos/capabilities.json
 recursive-include doc *.bat
 recursive-include doc *.ico
 recursive-include doc *.py
diff --git a/capabilities-data b/capabilities-data
index 8885283..3b5b35c 160000
--- a/capabilities-data
+++ b/capabilities-data
@@ -1 +1 @@
-Subproject commit 8885283d71a43758aa63d633fd2301df13dce9d5
+Subproject commit 3b5b35cfd35d297f9085ec16d47d1f77c3f1e768
diff --git a/readthedocs.yml b/readthedocs.yml
index ecf365d..d34f875 100644
--- a/readthedocs.yml
+++ b/readthedocs.yml
@@ -3,5 +3,5 @@ formats:
   - epub
 requirements_file: doc/requirements.txt
 python:
-  version: 2
+  version: 3
   setup_py_install: true
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 5f5e11f..41a5f23 100755
--- a/setup.py
+++ b/setup.py
@@ -65,8 +65,8 @@ setup(
         'Programming Language :: Python :: 3.5',
         'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: Implementation :: CPython',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Software Development :: Libraries :: Python Modules',
         'Topic :: Office/Business :: Financial :: Point-Of-Sale',
     ],
@@ -95,7 +95,7 @@ setup(
         'nose',
         'scripttest',
         'mock',
-        'hypothesis!=3.56.9,<4',
+        'hypothesis>4',
         'flake8'
     ],
     entry_points={
diff --git a/test/test_printer_file.py b/test/test_printer_file.py
index a03aec3..6cf3c5f 100644
--- a/test/test_printer_file.py
+++ b/test/test_printer_file.py
@@ -24,7 +24,6 @@ else:
 
 
 @pytest.mark.skip("this test is broken and has to be fixed or discarded")
-@settings(use_coverage=False)
 @given(path=text())
 def test_load_file_printer(mocker, path):
     """test the loading of the file-printer"""
@@ -36,7 +35,6 @@ def test_load_file_printer(mocker, path):
 
 
 @pytest.mark.skip("this test is broken and has to be fixed or discarded")
-@settings(deadline=None, use_coverage=False)
 @given(txt=text())
 def test_auto_flush(mocker, txt):
     """test auto_flush in file-printer"""
@@ -58,7 +56,6 @@ def test_auto_flush(mocker, txt):
 
 
 @pytest.mark.skip("this test is broken and has to be fixed or discarded")
-@settings(deadline=None, use_coverage=False)
 @given(txt=text())
 def test_flush_on_close(mocker, txt):
     """test flush on close in file-printer"""
diff --git a/tox.ini b/tox.ini
index 48b07b5..7b23804 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,12 @@
 [tox]
-envlist = py35, py36, py37, docs, flake8
+envlist = py35, py36, py37, py38, docs, flake8
+
+[gh-actions]
+python =
+    2.7: py27
+    3.6: py36
+    3.7: py37
+    3.8: py38
 
 [testenv]
 deps = nose
@@ -10,9 +17,9 @@ deps = nose
        pytest!=3.2.0,!=3.3.0
        pytest-cov
        pytest-mock
-       hypothesis!=3.56.9,<4
+       hypothesis>4
        python-barcode
-commands = py.test --cov escpos
+commands = pytest --cov escpos
 passenv = ESCPOS_CAPABILITIES_PICKLE_DIR ESCPOS_CAPABILITIES_FILE CI TRAVIS TRAVIS_* APPVEYOR APPVEYOR_* CODECOV_*
 
 [testenv:docs]