v0.7.9

• executor: better error handling @ #459
• introspection: ensuring fields & interfaces initialization @ #469
• docs: formatting & link fixes @ #487, #497
• tests: example of a query with variables @ #491
• executor: ordered execution of mutations @ #493
• examples: sql.NullString scalar example @ #501
• scalars: bitsize increased to 64 when parsing literals for floats @ #511
• examples/crud: better formatting @ #512
• testutil: test data fix @ #513
• rules: better check of overlapping fields @ #521
• scalars: un-serialization of time.Time support for DateTime @ #523
• introspection: fixes false-positive deprecation of fields @ #524
• extensions: better capture of errors for resolveFieldFinishFn @ #526