Add myself (rms-open-letter#11)

hippietilley · web-flow · commit 47ab1e5d5328 · 2021-03-23T11:34:59.000-07:00
diff --git a/index.md b/index.md
@@ -45,3 +45,4 @@ Signed,
 - Hayden Seay
 - Lucas Bickel
 - Colin Watson (Former Debian Technical Committee member)
+- Xavier Tilley
