Re-introduce Christian Neumüller to AUTHORS

Oberon00 · nicoddemus · commit 05850d73bd9d · 2019-09-12T08:05:50.000-03:00
The introduction was reverted by cd29d56
diff --git a/AUTHORS b/AUTHORS
@@ -56,6 +56,7 @@ Charnjit SiNGH (CCSJ)
 Chris Lamb
 Christian Boelsen
 Christian Fetzer
+Christian Neumüller
 Christian Theunert
 Christian Tismer
 Christopher Gilling
