Merge pull request #7 from pceuropa/dependabot/pip/cryptography-2.3

Bump cryptography from 2.2.2 to 2.3

Author: pceuropa

requirements.txt

@@ -86,7 +86,7 @@ cffi==1.11.5
 chardet==3.0.4
 click==6.7
 colorlog==3.1.4
-cryptography==2.2.2
+cryptography==2.3
 entrypoints==0.2.3
 Flask==0.12.2
 Flask-Cors==3.0.2