add m1sta to credits

README.md

@@ -85,6 +85,7 @@ If you want to make a rootless repo, use the official [palera1n repo](https://gi
 - [nyuszika7h](https://github.com/nyuszika7h) for the script to help get into DFU
 - [the Procursus Team](https://github.com/ProcursusTeam) for the amazing bootstrap
 - [F121](https://github.com/F121Live) for helping test
+- [m1sta](https://github.com/m1stadev) for pyimg4
 - [tihmstar](https://github.com/tihmstar) for pzb/original iBoot64Patcher/img4tool
 - [xerub](https://github.com/xerub) for img4lib and restored_external in the ramdisk
 - [Cryptic](https://github.com/Cryptiiiic) for iBoot64Patcher fork