Update cryptography from 2.1.4 to 2.3.1

pyup-bot · s-m-i-t-a · commit 63de2622b286 · 2018-08-29T10:14:47.000+02:00
diff --git a/requirements/development.txt b/requirements/development.txt
@@ -2,7 +2,7 @@
 
 bumpversion==0.5.3
 watchdog==0.8.3
-cryptography==2.1.4
+cryptography==2.3.1
 PyYAML==3.12
 coverage==4.5.1
 pep8==1.7.1
