pin cryptography to 1.2.1 to avoid entrypoint error, fixes #67

requirements.txt

@@ -1,5 +1,5 @@
 setuptools>=18.8.1
-cryptography>=1.3.1
+cryptography==1.2.1
 boto3>=1.1.3
 ruamel.yaml>=0.10.7
 ordereddict>=1.1