fix(package): update async to version 3.1.0

greenkeeper[bot] · greenkeeper[bot] · commit cda11831a4cf · 2019-06-23T05:33:12.000Z
Closes #8
diff --git a/package.json b/package.json
@@ -40,7 +40,7 @@
   },
   "dependencies": {
     "MD5": "^1.2.1",
-    "async": "^2.1.4",
+    "async": "^3.1.0",
     "bower": "^1.6.3",
     "debug": "^2.2.0"
   },
