chore(package): update karma-chrome-launcher to version 3.1.0

Closes #29

Author: greenkeeper[bot]

package.json

@@ -69,7 +69,7 @@
         "karma": "^4.0.1",
         "karma-chai": "^0.1.0",
         "karma-chai-sinon": "^0.1.5",
-        "karma-chrome-launcher": "^2.2.0",
+        "karma-chrome-launcher": "^3.1.0",
         "karma-coverage-istanbul-reporter": "^2.0.5",
         "karma-es6-shim": "^1.0.0",
         "karma-mocha": "^1.3.0",