[release] Add GPG key for 3.1.1 release
diff --git a/gpg_keys.txt b/gpg_keys.txt
index 851160b..e90a300 100644
--- a/gpg_keys.txt
+++ b/gpg_keys.txt
@@ -5,3 +5,4 @@
 2.2.2=1C1E2394D3194E1944613488F320986D35C33D6A
 3.0.0=1C1E2394D3194E1944613488F320986D35C33D6A
 3.1.0=73BC0A2B04ABC80BF0513382B0ED0E338D622A92
+3.1.1=73BC0A2B04ABC80BF0513382B0ED0E338D622A92