Clarify Discard::Model inclusion in README

It seems like this will be a common enough mistake. Hopefully this little hint will help some users.
jhawthorn · Apr 10, 2018 · 3a169f0 · 3a169f0
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commit 3a169f0
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diff --git a/README.md b/README.md
@@ -167,6 +167,10 @@ Callbacks can be run before, after, or around the discard and undiscard operatio
 A likely use is discarding or deleting associated records (but see "Working with associations" for an alternative).
 
 ``` ruby
+class Comment < ActiveRecord::Base
+  include Discard::Model
+end
+
 class Post < ActiveRecord::Base
   include Discard::Model