Fix FrozenError

Author: biow0lf

lib/errbit_github_plugin/issue_tracker.rb

@@ -7,10 +7,10 @@ class IssueTracker < ErrbitPlugin::IssueTracker
 
     LABEL = 'github'
 
-    NOTE = 'Please configure your github repository in the <strong>GITHUB ' <<
-           'REPO</strong> field above.<br/> Instead of providing your ' <<
-           'username & password, you can link your Github account to your ' <<
-           'user profile, and allow Errbit to create issues using your ' <<
+    NOTE = 'Please configure your github repository in the <strong>GITHUB ' \
+           'REPO</strong> field above.<br/> Instead of providing your ' \
+           'username & password, you can link your Github account to your ' \
+           'user profile, and allow Errbit to create issues using your ' \
            'OAuth token.'
 
     FIELDS = {