Update README.md

[rentiansheng]

fix: execute gqlgen generate command error. eg: systems failed: unable to build object definition: unable to find type: github.com/99designs/gqlgen/graphql/introspection.InputValue. need import github.com/99designs/gqlgen/graphql/introspection .

Describe your PR and link to any relevant issues.

I have:

• Added tests covering the bug / feature (see testing)
• Updated any relevant documentation (see docs)

[coveralls]

Coverage remained the same at 75.458% when pulling 5592405 on rentiansheng:patch-1 into 419dd96 on 99designs:master.

[StevenACoffman]

Thanks! If you get a chance, can you go through the whole tutorial and make sure it's still fresh? We've sometimes had problems where it gets stale.

Also, just pointing out anything that was confusing is very helpful! We get accustomed to things so it's hard for us to see what could be better improved.

[rentiansheng]

Thanks! If you get a chance, can you go through the whole tutorial and make sure it's still fresh? We've sometimes had problems where it gets stale.

Also, just pointing out anything that was confusing is very helpful! We get accustomed to things so it's hard for us to see what could be better improved.

I am a new user. I try my best