blacklist pytest 3.2.0 because it breaks our tests

see pytest-dev/pytest#2644 for reference

doc/requirements.txt

@@ -5,3 +5,4 @@ pyserial
 sphinx-rtd-theme
 setuptools-scm
 docutils>=0.12
+viivakoodi

setup.py

@@ -126,7 +126,7 @@ setup(
     tests_require=[
         'jaconv',
         'tox',
-        'pytest',
+        'pytest!=3.2.0',
         'pytest-cov',
         'pytest-mock',
         'nose',

tox.ini

@@ -7,7 +7,7 @@ deps = nose
        coverage
        scripttest
        mock
-       pytest
+       pytest!=3.2.0
        pytest-cov
        pytest-mock
        hypothesis
@@ -19,6 +19,7 @@ basepython = python
 changedir = doc
 deps = sphinx>=1.5.1
        setuptools_scm
+       viivakoodi
 commands = sphinx-build -W -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
 
 [testenv:flake8]