fix problems in CI for conventions.

On CI (Travis and Appveyor) the lint Checks does not run and therefore the master is dirty.

.travis.yml

@@ -5,7 +5,7 @@ matrix:
     include:
         - name: "docs,lint"
           python: "3.6"
-          env: TOXENV=docs,lint
+          env: TOXENV=docs,lint-py36
           before_install:
           after_success:
         - python: "2.7"
@@ -18,8 +18,10 @@ matrix:
           env: TOXENV=py37,py37-datetime
         - python: "3.8-dev"
           env: TOXENV=py38,py38-datetime
+
 before_install:
     -  travis_retry pip install -U -c constraints.txt coveralls coverage
+
 install:
     - travis_retry pip install -U pip setuptools
     - travis_retry pip install -U -c constraints.txt tox
@@ -33,5 +35,6 @@ after_success:
 
 notifications:
     email: false
+
 cache:
   pip: true

appveyor.yml

@@ -2,9 +2,9 @@
 
 environment:
   matrix:
-    - PROFILE: py27-conventions
-      PYTHON_VERSION: "2.7"
-      TOXENV: "lint,docs"
+    - PROFILE: conventions
+      PYTHON_VERSION: "3.6"
+      TOXENV: "docs,lint-py36"
     - PROFILE: py27
       PYTHON_VERSION: "2.7"
       TOXENV: "py27,py27-datetime"

tox.ini

@@ -33,7 +33,7 @@ deps =
     pytest-html
 
 [testenv:coverage]
-basepython = python2.7
+#basepython = python2.7
 skip_install = true
 
 deps =
@@ -48,10 +48,9 @@ commands =
     coverage combine
     coverage html
     coverage xml
-    coverage report --skip-covered --show-missing --fail-under=100.0
+    coverage report --show-missing --fail-under=100.0
 
 [testenv:isort-apply]
-basepython = python2.7
 skip_install = true
 deps =
     -cconstraints.txt
@@ -107,7 +106,6 @@ commands = {[lint]commands}
 whitelist_externals = {[lint]whitelist_externals}
 
 [testenv:docs]
-basepython = python3.6
 deps =
     -cconstraints.txt
     Sphinx