bump karma & its chrome and ff launcher

Author: etpinard

package-lock.json

@@ -136,10 +136,10 @@
     "into-stream": "^4.0.0",
     "jasmine-core": "^3.4.0",
     "jsdom": "^11.12.0",
-    "karma": "^4.2.0",
+    "karma": "^4.3.0",
     "karma-browserify": "^6.1.0",
-    "karma-chrome-launcher": "^3.0.0",
-    "karma-firefox-launcher": "^1.0.1",
+    "karma-chrome-launcher": "^3.1.0",
+    "karma-firefox-launcher": "^1.2.0",
     "karma-ie-launcher": "^1.0.0",
     "karma-jasmine": "^2.0.1",
     "karma-jasmine-spec-tags": "^1.1.0",