hide thor argument warning from AMS
hide thor argument warning from AMS

hide the warning "Expected string default value for '--serializer'; got
true (boolean)".  it's caused by active_model_serializers not properly
passing options to hook_for, but it just means you have to use
--serializer=true instead of just --serializer, and it only affects
arguments to the `rails generate resource` generator.

test plan: start a rails console, you shouldn't see the warning

Change-Id: I10faaa0c2ca5266d520ee18062a93b828ec879b0
Reviewed-on: https://gerrit.instructure.com/97380
Tested-by: Jenkins
Reviewed-by: Cody Cutrer <c4fe2b1d90ef8f2548c8aeabfa633434316f0305@instructure.com>
Product-Review: Bryan Petty <33564f6eff3d808d3eaaa056a1631fdcde5faed6@instructure.com>
QA-Review: Simon Williams <088e16a1019277b15d58faf0541e11910eb756f6@instructure.com>

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