remove json as a runtime dependency

Author: BenMorganIO

rspec_api_documentation.gemspec

@@ -17,7 +17,6 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency "rspec", "~> 3.0", ">= 3.0.0"
   s.add_runtime_dependency "activesupport", ">= 3.0.0"
   s.add_runtime_dependency "mustache", "~> 1.0", ">= 0.99.4"
-  s.add_runtime_dependency "json", "~> 1.4", ">= 1.4.6"
 
   s.add_development_dependency "bundler", "~> 1.0"
   s.add_development_dependency "fakefs", "~> 0.4"