Typo

Signed-off-by: Tyler Cloutier <cloutiertyler@users.noreply.github.com>

Author: cloutiertyler

README.md

@@ -22,7 +22,7 @@
      
     <a href="https://github.com/clockworklabs/spacetimedb"><img src="https://img.shields.io/badge/built_with-Rust-dca282.svg?style=flat-square"></a>
     &nbsp;
-	<a href="https://github.com/clockworklabs/spacetimedb/actions"><img src="https://img.shields.io/github/actions/workflow/status/clockworklabs/spacetimedb/ci.yml?style=flat-square&branch=main"></a>
+	<a href="https://github.com/clockworklabs/spacetimedb/actions"><img src="https://img.shields.io/github/actions/workflow/status/clockworklabs/spacetimedb/ci.yml?style=flat-square&branch=master"></a>
     &nbsp;
     <a href="https://status.spacetimedb.com"><img src="https://img.shields.io/uptimerobot/ratio/7/m784409192-e472ca350bb615372ededed7?label=cloud%20uptime&style=flat-square"></a>
     &nbsp;