chore(package): update source-map-support to version 0.5.15

Closes #12

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
     "nyc": "14.1.1",
     "prettier": "1.18.2",
     "rewire": "4.0.1",
-    "source-map-support": "0.5.12",
+    "source-map-support": "0.5.15",
     "superagent-mock": "3.7.0",
     "ts-node": "8.3.0",
     "tslint": "5.18.0",