Add MergeInitializer to Coercian example
Before: ```ruby class Tweet < Hash include Hashie::Extensions::Coercion coerce_key :user, User end user_hash = { name: "Bob" } Tweet.new(user: user_hash) # => {} ``` After: ```ruby class Tweet < Hash include Hashie::Extensions::Coercion include Hashie::Extensions::MergeInitializer coerce_key :user, User end user_hash = { name: "Bob" } Tweet.new(user: user_hash) #=> {:user=>#<struct User name={:name=>"Bob"}>} ```
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