v2.0.4 - bugfix release

Bugfixes

This is a small bugfix release that fixes an issue with showing errors when the graphql schema is invalid.
Thanks to @speller for fixing this (#15)

v2.0.3 - bugfix release

This release fixes a bug in the error handling that assumed a certain structure of the error object, which did not always apply.

This would happen on invalid schemas for example, and therefore the request would crash with cryptic errors rather than exposing the fact that the schema was invalid.

See more in #13 and #14