chore(package): update @types/mocha to version 5.2.0

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
   },
   "devDependencies": {
     "@types/chai": "^4.1.2",
-    "@types/mocha": "^5.0.0",
+    "@types/mocha": "^5.2.0",
     "babel-cli": "^6.26.0",
     "babel-core": "^6.26.0",
     "babel-eslint": "^8.2.2",