[release] Add GPG key for 2.2.1 release
diff --git a/gpg_keys.txt b/gpg_keys.txt
index 3ec6e95..82cec1f 100644
--- a/gpg_keys.txt
+++ b/gpg_keys.txt
@@ -1,3 +1,4 @@
 2.0.0=1C1E2394D3194E1944613488F320986D35C33D6A
 2.1.0=1C1E2394D3194E1944613488F320986D35C33D6A
 2.2.0=1C1E2394D3194E1944613488F320986D35C33D6A
+2.2.1=1C1E2394D3194E1944613488F320986D35C33D6A