fix annotate model

lib/tasks/annotate_rb.rake

@@ -0,0 +1,8 @@
+# This rake task was added by annotate_rb gem.
+
+# Can set `ANNOTATERB_SKIP_ON_DB_TASKS` to be anything to skip this
+if Rails.env.development? && ENV["ANNOTATERB_SKIP_ON_DB_TASKS"].nil?
+  require "annotate_rb"
+
+  AnnotateRb::Core.load_rake_tasks
+end