Broken blog link (#652)

Update README.md

Author: levkk

README.md

@@ -57,7 +57,7 @@ PgCat is stable and used in production to serve hundreds of thousands of queries
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-      <a href="https://postgresml.org/blog/scaling-postgresml-to-one-million-requests-per-second">
+      <a href="https://postgresml.org/blog/scaling-postgresml-to-1-million-requests-per-second">
         PostgresML
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