point CI at updated repo

Author: montanalow

README.md

@@ -1,6 +1,6 @@
 ##### PgCat: PostgreSQL at petabyte scale
 
-[![CircleCI](https://circleci.com/gh/levkk/pgcat/tree/main.svg?style=svg)](https://circleci.com/gh/levkk/pgcat/tree/main)
+[![CircleCI](https://circleci.com/gh/postgresml/pgcat/tree/main.svg?style=svg)](https://circleci.com/gh/postgresml/pgcat/tree/main)
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