fix: add ExecutableDefinitions to ignored rules for validation

[divyenduz]

1. Add ExecutableDefinitions to ignored rules for schema validation

[asiandrummer]

Makes sense :D

[danez]

This breaks as it requires now graphql 0.12 at least but the peer dependency still has 0.10 as minimum version.

[schickling]

Great point @danez. Unfortunately this wasn't caught by the tests. Do you think it's acceptable to increase the min peer dependency version to 0.12?

[danez]

Yes, I updated our project to 0.13 and now it works (still with some workarounds for graphiql as some of its dependencies require 0.12, which means two different versions in our bundles.)