Remove Confio from SECURITY.md

Author: webmaster128

SECURITY.md

@@ -1,5 +1,5 @@
 # Security Policy
 
-This repository is maintained by Confio as part of the CosmWasm stack. Please
-see https://github.com/CosmWasm/advisories/blob/main/SECURITY.md for our
-security policy.
+This repository is part of the CosmWasm stack. Please see
+https://github.com/CosmWasm/advisories/blob/main/SECURITY.md for its security
+policy.