chore(package): update karma-coverage to version 2.0.2

Closes #58

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "karma-browserify": "^5.3.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-cli": "^1.0.1",
-    "karma-coverage": "^1.1.2",
+    "karma-coverage": "^2.0.2",
     "karma-mocha": "^1.3.0",
     "mocha": "^5.0.0",
     "power-assert": "^1.4.4",