chore(deps): update dependency mocha to v5.2.0

Author: renovate-bot

package-lock.json

@@ -37,7 +37,7 @@
     "@types/mongodb": "3.0.18",
     "assert-rejects": "0.1.1",
     "jscpd": "0.6.17",
-    "mocha": "5.1.1",
+    "mocha": "5.2.0",
     "nyc": "11.8.0",
     "power-assert": "1.5.0",
     "rimraf": "2.6.2"