Allow deprecated directive on arguments (#541)

Refactor trace package (#513)

Remove dependency for graphql-go on OpenTracing and OpenTelemetry except
 where those tracers are explicitly configured for use.

validation: fix bug in maxDepth fragment spread logic (#492)

Accepting value Json in parameter of request's body in custom Scalar (#…

…467)

Accept JSON value in resolver args

Merge pull request #456 from savaki/master

errors.Errorf preserves original error similar to fmt.Error

Merge pull request #443 from eko/fix-369

Fixed duplicated __typename in response (fixes #369)