chore(package): update karma-coverage-istanbul-reporter to version 2.0.4

Closes #46

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "karma": "^1.7.1",
     "karma-chrome-launcher": "^2.2.0",
     "karma-cli": "^1.0.1",
-    "karma-coverage-istanbul-reporter": "^1.4.3",
+    "karma-coverage-istanbul-reporter": "^2.0.4",
     "karma-jasmine": "^1.1.2",
     "karma-jasmine-html-reporter": "^0.2.2",
     "protractor": "^5.3.2",