chore(package): update @types/mocha to version 2.2.42

Author: greenkeeper[bot]

package.json

@@ -22,7 +22,7 @@
   },
   "devDependencies": {
     "@types/form-data": "2.2.0",
-    "@types/mocha": "2.2.41",
+    "@types/mocha": "2.2.42",
     "@types/node": "8.0.24",
     "@types/should": "8.3.0",
     "codecov": "2.3.0",