chore(package): update source-map-support to version 0.4.15 (#391)

https://greenkeeper.io/

package.json

@@ -56,7 +56,7 @@
     "semver": "^5.0.0",
     "semver-sort": "0.0.4",
     "sinon": "^1.14.1",
-    "source-map-support": "^0.4.11"
+    "source-map-support": "^0.4.15"
   },
   "dependencies": {
     "yargs": "^8.0.1"