drop support for python 3.5

.github/workflows/pythonpackage.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.5, 3.6, 3.7, 3.8, 3.9]
+        python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2

setup.cfg

@@ -18,10 +18,10 @@ classifiers =
     Operating System :: OS Independent
     Programming Language :: Python
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Software Development :: Libraries :: Python Modules
     Topic :: Office/Business :: Financial :: Point-Of-Sale
@@ -31,7 +31,7 @@ project_urls =
     Release Notes = https://github.com/python-escpos/python-escpos/releases
 
 [options]
-python_requires = >=3.5
+python_requires = >=3.6
 zip_safe = false
 include_package_data = true
 install_requires =