Add myself (Christian Heimes) (rms-open-letter#28)

tiran · ehashman · web-flow · commit af94b8da4b4e · 2021-03-23T11:53:26.000-07:00
Co-authored-by: Elana Hashman &lt;ehashman@users.noreply.github.com&gt;
diff --git a/index.md b/index.md
@@ -66,3 +66,4 @@ Signed,
 - William Theaker (Former FSF staff member)
 - D. Joe Anderson
 - Ben Werdmuller
+- Christian Heimes (Python)
