chore(package): update mocha to version 5.0.0

Author: greenkeeper[bot]

package.json

@@ -81,7 +81,7 @@
     "karma-phantomjs-launcher": "^1.0.4",
     "karma-sauce-launcher": "^1.2.0",
     "mkdirp": "^0.5.1",
-    "mocha": "^4.0.1",
+    "mocha": "^5.0.0",
     "npm-run-all": "^3.1.2",
     "pouchdb-memory": "^6.0.0",
     "pouchdb-server": "^2.3.7",