chore(package): update redis to version 2.6.4 (#3364)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -35,7 +35,7 @@
     "parse-server-s3-adapter": "1.0.6",
     "parse-server-simple-mailgun-adapter": "1.0.0",
     "pg-promise": "5.5.0",
-    "redis": "2.6.3",
+    "redis": "2.6.4",
     "request": "2.79.0",
     "semver": "5.2.0",
     "tv4": "1.2.7",