Don't re-parse country codes YAML file every time it's needed. #111
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#109 added a country codes YAML file in order to remove the dependency on the
countries
gem. This is all well and good, but the current implementation reloads and re-parses that file every time the hash is needed. This potentially triggers reloading/parsing every time a phone number is normalized which adds a huge amount of unnecessary disk and CPU overhead to normalization.This patches adds a simple cache for that hash.