prepping 1.2.0

Merge pull request #111 from Dean177/patch-1

Update README.md

Changelog update

#63 adds support for super table

#59 adds post date field and makes datecreated/updated nonnull

fixing bug where multiple block types were ignoring empty check

Merge branch 'master' of github.com:markhuot/craftql

#40 fixing issue with dropdown enum loosing case

fixing option values that are non-standard

tags, categories, and a refactoring of fields