Broken link in post — Write your own code transform

[flexdinesh]

Link to existing macros is broken in Write your own code transform for fun and profit blog post.

I have learned so much about babel from the post. Thank you!

[kentcdodds]

Thanks!

@all-contributors please add @flexdinesh for bug

[allcontributors]

@kentcdodds

I've put up a pull request to add @flexdinesh! 🎉