v0.7.4
- travis: run tests against go 1.9.x & 1.8.x, removes unused cover pkg @ https://github.com/graphql-go/graphql/pull/249/files
- block string support @ #261
- schema definition language support @ #262
- fix for JSON struct tags @ https://github.com/graphql-go/graphql/pull/264/files
- perf. optimizations @ #265
- hide internal types @ #266
- invariantf @ #267
- benchmarks @ #268