Merge "Updates to latest versions of Ava and Mocha"

Author: Fleker

package.json

@@ -33,7 +33,7 @@
     "dependencies": {
         "@types/promise.prototype.finally": "^2.0.2",
         "@types/i18n": "^0.8.3",
-        "ava": "^0.20.0",
+        "ava": "^0.25.0",
         "googleapis": "^32.0.0",
         "google-auth-library": "^1.5.0",
         "google-proto-files": "^0.16.0",
@@ -48,7 +48,7 @@
         "@types/winston": "^2.3.9",
         "chai": "3.5.0",
         "chai-spies": "^0.7.1",
-        "mocha": "^3.0.2",
+        "mocha": "^5.2.0",
         "nyc": "^11.6.0",
         "sinon": "^6.0.0",
         "tslint": "^5.9.1",