chore(package): update mocha to version 7.2.0

Closes #18

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "@types/sinon-chai": "^3.2.0",
     "chai": "^4.1.2",
     "coveralls": "^3.0.2",
-    "mocha": "^5.2.0",
+    "mocha": "^7.2.0",
     "nyc": "^13.0.1",
     "sinon": "^6.3.5",
     "sinon-chai": "^3.2.0",