Fix typo in Mix task name

[s3cur3]

Thanks so much for Recode! It's made my devex sooooo much better. 💜

I was setting it up in a new project and ran into this typo when I copied and pasted the suggested command. Easy enough to diagnose for someone familiar with how the rest of the ecosystem works, but it could potentially trip someone up.

[NickNeck]

Thank you for your contribution and the kind words.