Only install code coverage dependencies on platforms which are going to do code coverage

Author: tleonhardt

tox.ini

@@ -3,6 +3,8 @@ envlist = py27,py33,py34,py35,py36,py37,pypy
 
 [testenv]
 passenv = CI TRAVIS TRAVIS_* APPVEYOR*
+
+[testenv:py27]
 deps =
   codecov
   mock
@@ -12,26 +14,61 @@ deps =
   pytest-cov
   pytest-xdist
   six
-
-[testenv:py27]
 commands =
   py.test -v -n2 --cov=cmd2 --basetemp={envtmpdir} {posargs}
   codecov
 
 [testenv:py33]
+deps =
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-xdist
+  six
 commands = py.test -v -n2
 
 [testenv:py34]
+deps =
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-xdist
+  six
 commands = py.test -v -n2
 
 [testenv:py35]
+deps =
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-xdist
+  six
 commands = py.test -v -n2
 
 [testenv:py36]
+deps =
+  codecov
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-cov
+  pytest-xdist
+  six
 commands =
   py.test -v -n2 --cov=cmd2 --basetemp={envtmpdir} {posargs}
   codecov
 
 [testenv:py37]
+deps =
+  mock
+  pyparsing
+  pyperclip
+  pytest
+  pytest-xdist
+  six
 commands = py.test -v -n2