Merge branch 'master' into common-crypto-backend

* master:
  Use pytest.fixture for backends
  drop to >= 0.8 to make pypy happy
  change to anonymous enum
  require cffi >= 0.8.1
  remove extraneous spaces
  add hmac to commoncrypto binding
  bytes byte back
  add check to confirm we've loaded error strings
  Bind all the PEM errors
  Spelling!
  oops, bytes plz
  don't leak a context in the test
  add tests to the openssl backend to verify that we've registered
  Nonsense I think we need.
  This is a dep
  init the ssl library in the backend
  Actuall install a thing
  Try to run the spellchecker on travis
  Use a normal quote here, not sure where the smart quote came from
  Expose ERR_load_SSL_strings

1 files changed, 1 insertions, 1 deletions

diff --git a/setup.py b/setup.py
index feed0cd8..e8bcc11f 100644
--- a/setup.py
+++ b/setup.py
@@ -23,7 +23,7 @@ with open(os.path.join(base_dir, "cryptography", "__about__.py")) as f:
     exec(f.read(), about)
 
 
-CFFI_DEPENDENCY = "cffi>=0.6"
+CFFI_DEPENDENCY = "cffi>=0.8"
 SIX_DEPENDENCY = "six>=1.4.1"
 
 requirements = [