temporary! Cap json dependency due to missing json:2.3.0-java

Author: pirj

Gemfile

@@ -43,7 +43,7 @@ else
 end
 
 if RUBY_VERSION >= '2.4.0'
-  gem 'json', '>= 2.0.2'
+  gem 'json', '>= 2.0.2', '< 2.3.0'
 end
 
 gem 'ffi', '~> 1.9.25'