Update AUTHORS

Added Stepan Mikhailiuk
according https://skia.org/docs/dev/contrib/#contribute-code

This is an imported pull request from
https://github.com/google/skia/pull/137

GitOrigin-RevId: e07f9505e34c2ca84b0a5f075d78e487c8295885
Change-Id: I5746b0b586e4552ade2fae8267a9c20cca5c8c15
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/688240
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed