feat(README): add reflex library to Readme

[HazarBakir]

reflex library is a great tool for build automation, so I wanted to add this to your repo, Thanks!

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Thank you for contributing to awesome-go. We will review your contribution as soon as possible.

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[yassinebenaid]

Is this still maintained @HazarBakir ? .

No updates for 3 years. PRs and Issues opened since 2014, some of them are bug declaration.

[HazarBakir]

after I checked, no it is not. I'll close the pr, thanks for the feedback.