chore(package): pin karma to 1.3.0 (#4002)

Karma 1.4.0 indavertantely broke IE8 when updating socket.io.
This pins karma to 1.3.0 a version that is known to work on IE8.

See karma-runner/karma#2556
See socketio/socket.io-client#1063

package.json

@@ -92,7 +92,7 @@
     "in-publish": "^2.0.0",
     "istanbul": "^0.4.5",
     "jsdoc": "^3.4.2",
-    "karma": "^1.2.0",
+    "karma": "1.3.0",
     "karma-browserify": "^5.1.0",
     "karma-browserstack-launcher": "^1.0.1",
     "karma-chrome-launcher": "^2.0.0",