fix: position_in_class uses a symbol, per the rake file

lib/annotate/annotate_models.rb

@@ -117,7 +117,7 @@ module AnnotateModels
     #
     # === Options (opts)
     #  :position<Symbol>:: where to place the annotated section in fixture or model file,
-    #                      "before" or "after". Default is "before".
+    #                      :before or :after. Default is :before.
     #  :position_in_class<Symbol>:: where to place the annotated section in model file
     #  :position_in_fixture<Symbol>:: where to place the annotated section in fixture file
     #  :position_in_others<Symbol>:: where to place the annotated section in the rest of
@@ -142,7 +142,7 @@ module AnnotateModels
           new_content = old_content.sub(/^# #{COMPAT_PREFIX}.*?\n(#.*\n)*\n/, info_block)
           # But, if there *was* no old schema info, we simply need to insert it
           if new_content == old_content
-            new_content = options[:position] == 'before' ?
+            new_content = options[:position] == :before ?
               (info_block + old_content) :
               ((old_content =~ /\n$/ ? old_content : old_content + '\n') + info_block)
           end