Update omniauth-github by pinning to git rev

omniauth-github hasn't released a fix yet so pin to a specific
rev per their recommendation in
omniauth/omniauth-github#88

Gemfile

@@ -28,7 +28,7 @@ gem 'semantic', git: 'https://github.com/librariesio/semantic'
 gem 'simple-rss'
 gem 'faraday-http-cache'
 gem 'fog-aws'
-gem 'omniauth-github'
+gem 'omniauth-github', git: 'https://github.com/omniauth/omniauth-github.git', ref: '967d769'
 gem 'dalli'
 gem 'counter_culture'
 gem 'simple_form'

Gemfile.lock

@@ -24,6 +24,15 @@ GIT
   specs:
     semantic (1.6.1)
 
+GIT
+  remote: https://github.com/omniauth/omniauth-github.git
+  revision: 967d76979b6bf9bb0b71b255ad204f8931f65be6
+  ref: 967d769
+  specs:
+    omniauth-github (1.3.0)
+      omniauth (~> 1.5)
+      omniauth-oauth2 (>= 1.4.0, < 2.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -383,9 +392,6 @@ GEM
       multi_json (~> 1.7)
       omniauth (~> 1.1)
       omniauth-oauth (~> 1.0)
-    omniauth-github (1.3.0)
-      omniauth (~> 1.5)
-      omniauth-oauth2 (>= 1.4.0, < 2.0)
     omniauth-gitlab (2.0.0)
       omniauth (~> 1.0)
       omniauth-oauth2 (~> 1.0)
@@ -694,7 +700,7 @@ DEPENDENCIES
   octokit
   oj
   omniauth-bitbucket
-  omniauth-github
+  omniauth-github!
   omniauth-gitlab
   org-ruby
   parallel