Update redis from 3.0.1 to 3.1.0 (#532)

Author: pyup-bot

requirements.txt

@@ -319,9 +319,9 @@ wcwidth==0.1.7 \
 zope.structuredtext==4.3 \
     --hash=sha256:b104e76b090179f11f0462ef7efb4d31378b0e4e20b1d844eae05d2da5e97d00 \
     --hash=sha256:59e8cac73e4d7e35b92411bb5d14cfef0ac651f495cebdf83f063f396abca29e
-redis==3.0.1 \
-    --hash=sha256:8e0bdd2de02e829b6225b25646f9fb9daffea99a252610d040409a6738541f0a \
-    --hash=sha256:2100750629beff143b6a200a2ea8e719fcf26420adabb81402895e144c5083cf
+redis==3.1.0 \
+    --hash=sha256:74c892041cba46078ae1ef845241548baa3bd3634f9a6f0f952f006eb1619c71 \
+    --hash=sha256:7ba8612bbfd966dea8c62322543fed0095da2834dbd5a7c124afbc617a156aa7
 dj-database-url==0.5.0 \
     --hash=sha256:851785365761ebe4994a921b433062309eb882fedd318e1b0fcecc607ed02da9 \
     --hash=sha256:4aeaeb1f573c74835b0686a2b46b85990571159ffc21aa57ecd4d1e1cb334163