Add more alumni

README.md

@@ -489,7 +489,8 @@ Shoulda Matchers follows Semantic Versioning 2.0 as defined at
 Shoulda Matchers is currently maintained by [Pedro Paiva][VSPPedro] and [Matheus
 Sales][matsales28]. Previous maintainers include [Elliot Winkler][mcmire],
 [Gui Albuk][guialbuk], [Jason Draper][drapergeek], [Melissa Xie][mxie],
-[Ryan McGeary][rmm5t], [Joe Ferris][jferris], and [Tammer Saleh][tammersaleh].
+[Ryan McGeary][rmm5t], [Gabe Berke-Williams][gabebw], [Joe Ferris][jferris], and
+[Tammer Saleh][tammersaleh].
 
 [VSPPedro]: https://github.com/VSPPedro
 [matsales28]: https://github.com/matsales28
@@ -498,6 +499,7 @@ Sales][matsales28]. Previous maintainers include [Elliot Winkler][mcmire],
 [drapergeek]: https://github.com/drapergeek
 [mxie]: https://github.com/mxie
 [rmm5t]: https://github.com/rmm5t
+[gabebw]: https://github.com/gabebw
 [jferris]: https://github.com/jferris
 [tammersaleh]: https://github.com/tammersaleh