Update _coverpage.md

Author: mgrachev

docs/_coverpage.md

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 <img alt="logo" width="420" src="_assets/logo.svg?sanitize=true">
 
 > ⚡️ Lightning-fast linter for <code>.env</code> files. Written in Rust 🦀
+<br/><br/>
+<a href="https://github.com/dotenv-linter/dotenv-linter/issues/468">⚠️ Please vote for dotenv-linter ⚠️</a>
 
 [GitHub](https://github.com/dotenv-linter/dotenv-linter)
 [Getting Started](#dotenv-linter)