[Gemfile] Use 2.2+ compatible JSON fork

Gemfile

@@ -5,7 +5,9 @@ gemspec
 gem 'claide', :git => 'https://github.com/CocoaPods/CLAide'
 
 # This is the version that ships with OS X 10.10, so be sure we test against it.
-gem 'json', '1.7.7'
+# At the same time, the 1.7.7 version won't install cleanly on Ruby > 2.2,
+# so we use a fork that makes a trivial change to a macro invocation.
+gem 'json', :git => 'https://github.com/segiddins/json.git', :branch => 'seg-1.7.7-ruby-2.2'
 
 group :development do
   gem 'mocha'

Gemfile.lock

@@ -4,6 +4,13 @@ GIT
   specs:
     claide (1.0.0)
 
+GIT
+  remote: https://github.com/segiddins/json.git
+  revision: a9588bc4334c2f5bf985f255b61c05eafdcd8907
+  branch: seg-1.7.7-ruby-2.2
+  specs:
+    json (1.7.7)
+
 PATH
   remote: .
   specs:
@@ -29,7 +36,6 @@ GEM
     docile (1.1.5)
     ffi (1.9.6)
     i18n (0.7.0)
-    json (1.7.7)
     kicker (3.0.0)
       listen (~> 1.3.0)
       notify (~> 0.5.2)
@@ -81,7 +87,7 @@ DEPENDENCIES
   bacon
   claide!
   codeclimate-test-reporter
-  json (= 1.7.7)
+  json!
   kicker
   mocha
   mocha-on-bacon