chore(package): update request to version 2.78.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -30,7 +30,7 @@
   "dependencies": {
     "gm": "^1.23.0",
     "picture-tube": "^1.0.0",
-    "request": "^2.75.0",
+    "request": "^2.78.0",
     "request-promise": "^4.1.1",
     "yargs": "^6.0.0"
   },