chore(dependencies): Bump github_api from 0.17.0 to 0.18.2

Bumps [github_api](https://github.com/piotrmurach/github) from 0.17.0 to 0.18.2.
- [Changelog](https://github.com/piotrmurach/github/blob/master/CHANGELOG.md)
- [Commits](piotrmurach/github@v0.17.0...v0.18.2)

Gemfile

@@ -28,7 +28,7 @@ gem 'turbolinks'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 gem 'jbuilder', '~> 2.6'
 
-gem "github_api", '~> 0.17'
+gem "github_api", '~> 0.18'
 
 gem 'bootstrap-sass', '~> 3.3.7'
 gem 'font-awesome-rails', '~> 4.7.0'

Gemfile.lock

@@ -108,7 +108,7 @@ GEM
     factory_girl_rails (4.9.0)
       factory_girl (~> 4.9.0)
       railties (>= 3.0.0)
-    faraday (0.9.2)
+    faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
     faraday_middleware (0.11.0.1)
       faraday (>= 0.7.4, < 1.0)
@@ -124,12 +124,11 @@ GEM
       net-http-persistent (~> 2.9)
       net-http-pipeline
     gherkin (4.1.3)
-    github_api (0.17.0)
-      addressable (~> 2.4.0)
+    github_api (0.18.2)
+      addressable (~> 2.4)
       descendants_tracker (~> 0.0.4)
-      faraday (~> 0.8, < 0.10)
-      hashie (>= 3.4)
-      mime-types (>= 1.16, < 3.0)
+      faraday (~> 0.8)
+      hashie (~> 3.5, >= 3.5.2)
       oauth2 (~> 1.0)
     guard (2.14.1)
       formatador (>= 0.2.4)
@@ -150,7 +149,7 @@ GEM
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
     hashdiff (0.3.4)
-    hashie (3.5.5)
+    hashie (3.5.6)
     highline (1.7.8)
     i18n (0.9.0)
       concurrent-ruby (~> 1.0)
@@ -173,7 +172,9 @@ GEM
     mail (2.6.6)
       mime-types (>= 1.16, < 4)
     method_source (0.8.2)
-    mime-types (2.99.3)
+    mime-types (3.1)
+      mime-types-data (~> 3.2015)
+    mime-types-data (3.2016.0521)
     mini_mime (0.1.3)
     mini_portile2 (2.2.0)
     minitest (4.7.5)
@@ -349,7 +350,7 @@ DEPENDENCIES
   dotenv-rails
   factory_girl_rails
   font-awesome-rails (~> 4.7.0)
-  github_api (~> 0.17)
+  github_api (~> 0.18)
   guard
   guard-cucumber
   guard-rspec