Update karma.conf.js

Author: tivie

karma.conf.js

@@ -8,6 +8,7 @@ module.exports = function (config) {
       'bower_components/angular-sanitize/angular-sanitize.js',
       'bower_components/angular-mocks/angular-mocks.js',
       'bower_components/showdown/dist/showdown.js',
+      'bower_components/showdown-twitter/dist/showdown-twitter.js',
       'markdown.js',
       '*.spec.js'
     ],