Update AUTHORS.md

Author: feross

AUTHORS.md

@@ -142,5 +142,6 @@
 - Elad Chen (eladchen@gmail.com)
 - Dave Carlson (davecarlson@users.noreply.github.com)
 - greenkeeper[bot] (23040076+greenkeeper[bot]@users.noreply.github.com)
+- epixian (38962121+epixian@users.noreply.github.com)
 
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