[DOC] README: haskell badge has wrong style

#93

README.md

@@ -1,7 +1,7 @@
 <h1 align="center">Smart Order Router</h1>
 <p align="center">
     <a href="https://github.com/geniusyield/smart-order-router/actions?query=branch%3Amain"><img src="https://img.shields.io/github/actions/workflow/status/geniusyield/smart-order-router/build.yml?style=flat-square&branch=main&label=Build" /></a>
-    <a href="https://www.haskell.org/"><img alt="GitHub top language" src="https://img.shields.io/github/languages/top/geniusyield/smart-order-router"></a>
+    <a href="https://www.haskell.org/"><img alt="GitHub top language" src="https://img.shields.io/github/languages/top/geniusyield/smart-order-router?style=flat-square"></a>
     <a href="https://github.com/geniusyield/smart-order-router/commits/main"><img src="https://img.shields.io/github/commit-activity/m/geniusyield/smart-order-router?style=flat-square&label=Commit%20Activity" /></a>
     <a href="https://github.com/geniusyield/smart-order-router/blob/main/LICENSE"><img src="https://img.shields.io/github/license/geniusyield/smart-order-router?style=flat-square&label=Licence" /></a>
     <a href="./CONTRIBUTING.md"><img src="https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square" /></a>