update dev dependencies

Author: ecarriou

package-lock.json

@@ -56,7 +56,7 @@
     "grunt-mocha-istanbul": "5.0.2",
     "grunt-prettier": "1.1.0",
     "istanbul": "0.4.5",
-    "karma": "3.1.3",
+    "karma": "3.1.4",
     "karma-chai": "0.1.0",
     "karma-chrome-launcher": "2.2.0",
     "karma-coverage": "1.1.2",