Gemfile in newrelic_rpm-3.18.1.330

- old
+ new

@@ -6,9 +6,10 @@
 gem 'rake', '~>10.1.1'
 gem 'minitest', '~>4.7.5'
 gem 'mocha', :require => false
 gem 'rack', '< 2.0.0'
 gem 'rack-test'
+gem 'json', '< 1.8.5' if RUBY_VERSION == "1.8.7"
 
 gem 'newrelic_rpm', :path => '../../..'
 
 if (RUBY_PLATFORM == 'java')
   gem "activerecord-jdbcmysql-adapter"