chore: yml -> yaml in readme

Author: cyyynthia

README.md

@@ -2,7 +2,7 @@
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+[![Build](https://img.shields.io/github/actions/workflow/status/squirrelchat/smol-toml/build.yaml?style=flat-square&logo=github)](https://github.com/squirrelchat/smol-toml/actions/workflows/build.yaml)
 
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