readme: update shield syntax (badges/shields#8671)

README.md

@@ -3,7 +3,7 @@
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+  <a title="'Site' workflow Status" href="https://github.com/hdl/awesome/actions/workflows/site.yml"><img alt="'Site' workflow Status" src="https://img.shields.io/github/actions/workflow/status/hdl/awesome/site.yml?branch=develop&longCache=true&style=flat-square&label=site&logoColor=fff&logo=GitHub%20Actions"></a><!--
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