Fix tests

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

features/steps/project/merge_requests.rb

@@ -156,7 +156,7 @@ class Spinach::Features::ProjectMergeRequests < Spinach::FeatureSteps
   end
 
   step 'merge request is mergeable' do
-    page.should have_content 'You can accept this request automatically'
+    page.should have_button 'Accept Merge Request'
   end
 
   step 'I modify merge commit message' do