Add myself (rms-open-letter#19)

lilithlavender · ehashman · web-flow · commit f4446b5fc508 · 2021-03-23T11:44:09.000-07:00
Co-authored-by: Elana Hashman &lt;ehashman@users.noreply.github.com&gt;
diff --git a/index.md b/index.md
@@ -56,3 +56,4 @@ Signed,
 - Amy Troschinetz
 - Antoine Beaupré AKA anarcat (Debian Developer, former FSF member)
 - Emmanuele Bassi (GNOME Foundation)
+- Daniel Soskel
