Sign the CLA.

As discussed in the #3695.

CONTRIBUTORS.md

@@ -69,3 +69,4 @@ username|name|email (optional)
 @tycho|Steven Noonan|steven@uplinklabs.net
 @philwhineray|Phil Whineray|
 @paulfantom|Pawel Krupa|pawel@krupa.net.pl
+@Ferroin|Austin S. Hemmelgarn|ahferroin7@gmail.com