fix for 'in' operator; test passes

Author: eropple

json_logic.gemspec

@@ -23,4 +23,5 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'bundler',  '~> 1.13'
   spec.add_development_dependency 'rake',     '~> 10.0'
   spec.add_development_dependency 'minitest', '~> 5.0'
+  spec.add_development_dependency 'pry'
 end

lib/json_logic/operation.rb

@@ -92,7 +92,7 @@ class Operation
       '%'     => ->(v, d) { v.map(&:to_i).reduce(:%) },
       '^'     => ->(v, d) { v.map(&:to_f).reduce(:**) },
       'merge' => ->(v, d) { v.flatten },
-      'in'    => ->(v, d) { v[1].include? v[0] },
+      'in'    => ->(v, d) { interpolated_block(v[1], d).include? v[0] },
       'cat'   => ->(v, d) { v.map(&:to_s).join },
       'log'   => ->(v, d) { puts v }
     }