Update cryptography from 2.3.1 to 2.4.1

pyup-bot · wwwjfy · commit b4c64887a8f7 · 2018-11-17T17:55:25.000+08:00
diff --git a/requirements_dev.txt b/requirements_dev.txt
@@ -3,7 +3,7 @@ pip==18.1  # pyup: update minor
 
 bumpversion==0.5.3  # pyup: update minor
 wheel==0.32.2  # pyup: update minor
-cryptography==2.3.1  # pyup: update minor
+cryptography==2.4.1  # pyup: update minor
 psycopg2-binary==2.7.6.1
 sanic==0.8.3
 aiohttp==3.4.4
