Don't run code coverage in Python 3.6 on Windows

Author: tleonhardt

.appveyor.yml

@@ -4,4 +4,4 @@ install:
 build: off
 
 test_script:
-  - python -m tox -e py27,py35,py36
+  - python -m tox -e py27,py35,py36-win

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27,py33,py34,py35,py36,py37,pypy
+envlist = py27,py33,py34,py35,py36,py36-winpy37,pypy
 
 [testenv]
 passenv = CI TRAVIS TRAVIS_* APPVEYOR*
@@ -60,6 +60,16 @@ commands =
   py.test -v --cov=cmd2 --basetemp={envtmpdir} {posargs}
   codecov
 
+[testenv:py36-win]
+deps =
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-xdist
+  six
+commands = py.test -v -n2
+
 [testenv:py37]
 deps =
   mock