test: disable running firefox on Travis-CI for now

Author: MasterOdin

.travis.yml

@@ -15,7 +15,7 @@ install:
 
 script:
   - npm run lint
-  - npm test
+  - npm test -- --browsers ChromeHeadless
   - npm run build
 
 after_script:

karma.conf.js

@@ -34,7 +34,10 @@ module.exports = function(config) {
 
     autoWatch: true,
 
-    browsers: ['FirefoxHeadless', 'ChromeHeadless'],
+    browsers: [
+      'FirefoxHeadless',
+      'ChromeHeadless'
+    ],
 
     singleRun: false,