[release] Add GPG key for 2.2.0 release
diff --git a/gpg_keys.txt b/gpg_keys.txt
index 8d122ad..3ec6e95 100644
--- a/gpg_keys.txt
+++ b/gpg_keys.txt
@@ -1,2 +1,3 @@
 2.0.0=1C1E2394D3194E1944613488F320986D35C33D6A
 2.1.0=1C1E2394D3194E1944613488F320986D35C33D6A
+2.2.0=1C1E2394D3194E1944613488F320986D35C33D6A