Enable this gem to be used with Rails versions prior to 4.x#5

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reubenjs wants to merge 1 commit intosaasu:masterfrom

reubenjs:rails-older-than-4

Commits on Dec 3, 2020

This gem uses Hash.deep_hash_transform which is only available if using Rails 4+. basecamp have backported these functions, so add their gem as a dependency
reuben salagaras
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