Allow APPVEYOR environment variable in tox
@@ -8,7 +8,7 @@ commands=
nosetests []
setenv =
PYTHONWARNINGS=always::DeprecationWarning
-passenv = CFLAGS LDFLAGS TRAVIS CRYPTOGRAPHY_OSX_NO_LINK_FLAGS
+passenv = CFLAGS LDFLAGS TRAVIS APPVEYOR CRYPTOGRAPHY_OSX_NO_LINK_FLAGS
[testenv:py26]
# Additional dependency on unittest2 for Python 2.6
