Add Jannis Leidel to the list of contributors.
diff --git a/AUTHORS b/AUTHORS
index 0c406ba..449c69e 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -11,6 +11,7 @@
 - Felipe Talavera
 - Guillaume-Jean Herbiet
 - Joseph A. Levin
+- Jannis Leidel
 - Konstantin Tjuterev
 
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