chore(package): update karma-coverage-istanbul-reporter to version 3.0.3

Closes #42

Author: greenkeeper[bot]

package.json

@@ -75,7 +75,7 @@
         "karma-chai": "^0.1.0",
         "karma-chai-sinon": "^0.1.5",
         "karma-chrome-launcher": "^2.2.0",
-        "karma-coverage-istanbul-reporter": "^2.0.4",
+        "karma-coverage-istanbul-reporter": "^3.0.3",
         "karma-es6-shim": "^1.0.0",
         "karma-mocha": "^1.3.0",
         "karma-mocha-reporter": "^2.2.5",