Replace soft-deprecated constant HashWithIndifferentAccess to ActiveSupport::HashWithIndifferentAccess (#699)

Author: naari3

lib/annotate.rb

@@ -54,7 +54,7 @@ def self.set_defaults(options = {})
     return if @has_set_defaults
     @has_set_defaults = true
 
-    options = HashWithIndifferentAccess.new(options)
+    options = ActiveSupport::HashWithIndifferentAccess.new(options)
 
     all_options.flatten.each do |key|
       if options.key?(key)