Update readme

README.md

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 # create-gh-release-action
 
-GitHub Action for creating GitHub Releases based on changelog.
+[![build status](https://img.shields.io/github/workflow/status/taiki-e/create-gh-release-action/CI/main?style=flat-square&logo=github)](https://github.com/taiki-e/create-gh-release-action/actions)
 
-<!-- TOC depthfrom:2 -->
+GitHub Action for creating GitHub Releases based on changelog.
 
 - [Usage](#usage)
   - [Inputs](#inputs)
@@ -13,8 +13,6 @@ GitHub Action for creating GitHub Releases based on changelog.
 - [Related Projects](#related-projects)
 - [License](#license)
 
-<!-- /TOC -->
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 ## Usage
 
 This action creates GitHub Releases based on changelog that specified by `changelog` option.