Quiet LineEndings spec

Author: sds

spec/overcommit/hook/pre_commit/line_endings_spec.rb

@@ -24,7 +24,7 @@
   around do |example|
     repo do
       File.open(staged_file, 'w') { |f| f.write(contents) }
-      `git add #{staged_file}`
+      `git add #{staged_file} > #{File::NULL} 2>&1`
       example.run
     end
   end