chore(package): update karma-sauce-launcher to version 4.1.2

Closes #180

Author: greenkeeper[bot]

package.json

@@ -103,7 +103,7 @@
     "karma-mocha": "1.3.0",
     "karma-mocha-reporter": "2.2.5",
     "karma-phantomjs-launcher": "1.0.4",
-    "karma-sauce-launcher": "1.2.0",
+    "karma-sauce-launcher": "4.1.2",
     "karma-sinon-chai": "1.3.3",
     "karma-sourcemap-loader": "0.3.7",
     "karma-webpack": "2.0.5",