Use CircleCI v2 (#9)

* Use CircleCI v2

* Add yarn.lock to CircleCI workspace

* Add vendor/* to CircleCI workspace

Pass options to handler (#8)

* Pass options to handler function

* Update README.md for options in handler function

* Update promise handling

* General rewriting

* Update JS module exports

Add serverless object to handler (#7)

Use TypeScript and compile to JS on release (#4)

* Use TypeScript and compile to JS on release

* clean up

* Update package.json

* Make list of hooks public

Update stage and region handling (#3)

* Add tests

* Update stage and region handling

Update README (#2)

Change format handling and add tests (#1)

Add dot-json dependency

Add jest dependency