Move coverage configuration to .coveragerc. Saves characters and separates concerns.

.coveragerc

+[run]
+source=
+	pkg_resources
+	setuptools
+omit=
+	*/_vendor/*
+
+[report]

tox.ini

@@ -23,7 +23,7 @@ setenv =
 # TODO: The passed environment variables came from copying other tox.ini files
 # These should probably be individually annotated to explain what needs them.
 passenv=APPDATA HOMEDRIVE HOMEPATH windir Program* CommonProgram* VS* APPVEYOR APPVEYOR_* CI CODECOV_* TRAVIS TRAVIS_* NETWORK_REQUIRED
-commands=pytest --cov-config={toxinidir}/tox.ini --cov-report= {posargs}
+commands=pytest {posargs}
 usedevelop=True
 extras =
 	tests
@@ -53,13 +53,6 @@ changedir = docs
 commands =
         python -m sphinx . {toxinidir}/build/html
 
-[coverage:run]
-source=
-	pkg_resources
-	setuptools
-omit=
-	*/_vendor/*
-
 [testenv:finalize]
 skip_install = True
 deps =