Add Xiaoxiang's new key

Expires after 3 years
diff --git a/KEYS b/KEYS
index 8c0fa0b..e2eb159 100644
--- a/KEYS
+++ b/KEYS
@@ -478,3 +478,108 @@
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 =DvSV
 -----END PGP PUBLIC KEY BLOCK-----
+pub   4096R/FE51C3EF 2021-02-02 [expires: 2024-02-02]
+uid                  Xiaoxiang Yu (Signing key for Kylin project) <xxyu@apache.org>
+sig 3        FE51C3EF 2021-02-02  Xiaoxiang Yu (Signing key for Kylin project) <xxyu@apache.org>
+sub   4096R/26D55168 2021-02-02 [expires: 2024-02-02]
+sig          FE51C3EF 2021-02-02  Xiaoxiang Yu (Signing key for Kylin project) <xxyu@apache.org>
+
+-----BEGIN PGP PUBLIC KEY BLOCK-----
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