chore(package): update karma-sauce-launcher to version 4.1.5

Closes #71

Author: greenkeeper[bot]

package.json

@@ -72,7 +72,7 @@
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.1",
     "karma-phantomjs-launcher": "1.0.2",
-    "karma-sauce-launcher": "1.1.0",
+    "karma-sauce-launcher": "4.1.5",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "1.8.0",
     "mkdirp": "0.5.1",