Fix the error when it is in ruby version 2.0

Author: Joselito Tapangan

lib/stackify-api-ruby.rb

@@ -107,7 +107,7 @@ def run async = true
       if Stackify.is_valid?
         at_exit { make_remained_job }
         t1 = Thread.new { Stackify.authorize }
-        Stackify::EnvDetails.instance.set_rails_info if (Object.const_defined?('Rails::Info'))
+        Stackify::EnvDetails.instance.set_rails_info
         case Stackify.configuration.mode
         when MODES[:both]
           t2 = start_logging

lib/stackify/env_details.rb

@@ -25,6 +25,13 @@ def initialize
     end
 
     def set_rails_info
+      begin
+        if (!Object.const_defined?('Rails::Info'))
+          return
+        end
+      rescue NameError => exception
+        return
+      end
       rails_info = defined?(Rails) ? Rails::Info.properties.to_h : nil
       @info =  rails_info || { 'Application root' => Dir.pwd, 'Environment' => 'development'}
       @request_details = {}