update karma dependency

Author: Plaristote

package.json

@@ -24,9 +24,9 @@
     "gulp-uglify": "^3.0.0",
     "jasmine-core": "^2.4.1",
     "jsdom": "^9.3.0",
-    "karma": "^2.0.2",
-    "karma-chrome-launcher": "^2.2.0",
-    "karma-coverage": "^1.1.1",
+    "karma": "^6.3.17",
+    "karma-chrome-launcher": "^3.1.1",
+    "karma-coverage": "^2.2.0",
     "karma-jasmine": "^1.0.2",
     "karma-spec-reporter": "~0.0.26",
     "mkdirp": "^0.5.1",