docs: improve code coverage

Signed-off-by: will Farrell <willfarrell@proton.me>

README.md

@@ -21,7 +21,7 @@
   <a href="https://biomejs.dev"><img alt="Checked with Biome" src="https://img.shields.io/badge/Checked_with-Biome-60a5fa?style=flat&logo=biome"></a>
   <a href="https://conventionalcommits.org"><img alt="Conventional Commits" src="https://img.shields.io/badge/Conventional%20Commits-1.0.0-%23FE5196?logo=conventionalcommits&logoColor=white"></a>
   <a href="https://github.com/middyjs/middy/blob/main/package.json#L32">
-  <img alt="code coverage" src="https://img.shields.io/badge/code%20coverage-99%25-brightgreen"></a>
+  <img alt="code coverage" src="https://img.shields.io/badge/code%20coverage-100%25-brightgreen"></a>
   <br/>
   <a href="https://gitter.im/middyjs/Lobby"><img src="https://badges.gitter.im/gitterHQ/gitter.svg" alt="Chat on Gitter" style="max-width:100%;"></a>
   <a href="https://stackoverflow.com/questions/tagged/middy?sort=Newest&uqlId=35052"><img src="https://img.shields.io/badge/StackOverflow-[middy]-yellow" alt="Ask questions on StackOverflow" style="max-width:100%;"></a>