adding changelog

Hey, it would be nice if we started keeping a changelog to explain what changed between versions.  Here is my token attempt to start one.
Space between More and information is needed
what is i18n ?
Spelling check: 'of' to 'off', 'exeption' to 'exception'
Grammar: 'raise exeption if api response does not contain metadata.' to 'raise exception if 'an' api response does not contain metadata.'