V1.2.0

This release adds more helpers operating on keys and values in KVLists, namely:

• filter_by_keys/2, filter_by_values/2
• each_key/2, each_value/2
• any_key?/2, any_value?/2

Another new thing is get_updated function for maps and get_updated_in for types implementing Access behaviour. They are simple wrappers for get_and_update and get_and_update_in that return the updated value.