Merge pull request #142 from smashwilson/dependabot/npm_and_yarn/async-3.2.4

Bump async from 3.2.0 to 3.2.4

Author: smashwilson

package-lock.json

@@ -35,7 +35,7 @@
     "url": "https://github.com/smashwilson/hubot-markov/issues"
   },
   "dependencies": {
-    "async": "3.2.0",
+    "async": "3.2.4",
     "coffee-script": "~1.12.7",
     "pg-promise": "^10.1.0",
     "redis": "~3.1.0"