Update dependencies to enable Greenkeeper 🌴 (#31)

* chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -14,10 +14,10 @@
     "requirejs": "^2.3.3"
   },
   "devDependencies": {
-    "coveralls": "^2.13.0",
+    "coveralls": "^3.0.0",
     "eslint": "^4.6.1",
     "istanbul": "^0.4.5",
-    "mocha": "^3.2.0",
+    "mocha": "^4.0.1",
     "mocha-lcov-reporter": "^1.3.0",
     "should": "^13.0.1"
   },