Test for milestone changed comment

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

spec/features/issues_spec.rb

@@ -248,7 +248,7 @@ describe "Issues", feature: true do
         find('.edit-issue.inline-update').select(milestone.title, from: 'issue_milestone_id')
         click_button 'Update Issue'
 
-        page.should have_content "Milestone"
+        page.should have_content "Milestone changed to #{milestone.title}"
         page.has_select?('issue_assignee_id', :selected => milestone.title)
       end
     end