Upgrades dependencies

Author: philipstanislaus

package.json

@@ -12,9 +12,9 @@
     "@types/chai": "^4.0.4",
     "@types/mocha": "^2.2.41",
     "chai": "^4.1.2",
-    "coveralls": "^2.13.1",
+    "coveralls": "^3.0.0",
     "istanbul": "^0.4.5",
-    "mocha": "^3.3.0",
+    "mocha": "^4.0.1",
     "mocha-lcov-reporter": "^1.3.0",
     "remap-istanbul": "^0.9.5",
     "tslint": "^5.2.0",