fix chunk.io url

Dangerfile

@@ -33,7 +33,7 @@ def upload_report
 	  `log_success "Successfully uploaded #{zip_filename} to chunk.io"`
 
       # set value of sticky to true and the message is kept after new commits are submited to the PR
-	  message("Please check the [regression diff report](#{report_url}/index.html) to make sure that everything is expected", sticky: true)
+	  message("Please check the [regression diff report](#{report_url}/diff/index.html) to make sure that everything is expected", sticky: true)
 	else
 	  `log_error "Error while uploading #{zip_filename} to chunk.io: #{report_url}"`
     end