Update a grit to newer version

Gemfile

@@ -23,7 +23,7 @@ gem 'omniauth-github'
 
 # Extracting information from a git repository
 # Since gollum requires grit we cannot use gitlab-grit gem name any more. Use grit instead
-gem "grit", '~> 2.5.0', git: 'https://github.com/gitlabhq/grit.git', ref: 'c40a32432616a07fa7fc3c32c24ab73ad6a9718f'
+gem "grit", '~> 2.5.0', git: 'https://github.com/gitlabhq/grit.git', ref: 'c15e2758ec75f99230cd0fbcc9110bf932c0bf05'
 gem 'grit_ext', '~> 0.8.1'
 
 # Ruby/Rack Git Smart-HTTP Server Handler

Gemfile.lock

@@ -8,8 +8,8 @@ GIT
 
 GIT
   remote: https://github.com/gitlabhq/grit.git
-  revision: c40a32432616a07fa7fc3c32c24ab73ad6a9718f
-  ref: c40a32432616a07fa7fc3c32c24ab73ad6a9718f
+  revision: c15e2758ec75f99230cd0fbcc9110bf932c0bf05
+  ref: c15e2758ec75f99230cd0fbcc9110bf932c0bf05
   specs:
     grit (2.5.0)
       diff-lcs (~> 1.1)