chore: README.md: remove .svg from badges (#252)

It's the default

Co-authored-by: Justin Beckwith <beckwith@google.com>

Author: XhmikosR

README.md

@@ -2,12 +2,12 @@
 
 > A super simple site crawler and broken link checker.
 
-[![npm version](https://img.shields.io/npm/v/linkinator.svg)](https://www.npmjs.org/package/linkinator)
+[![npm version](https://img.shields.io/npm/v/linkinator)](https://www.npmjs.org/package/linkinator)
 [![Build Status](https://img.shields.io/github/workflow/status/JustinBeckwith/linkinator/ci/main)](https://github.com/JustinBeckwith/linkinator/actions?query=branch%3Amain+workflow%3Aci)
 [![codecov](https://img.shields.io/codecov/c/github/JustinBeckwith/linkinator/main)](https://codecov.io/gh/JustinBeckwith/linkinator)
 [![Known Vulnerabilities](https://img.shields.io/snyk/vulnerabilities/github/JustinBeckwith/linkinator)](https://snyk.io/test/github/JustinBeckwith/linkinator)
-[![Code Style: Google](https://img.shields.io/badge/code%20style-google-blueviolet.svg)](https://github.com/google/gts)
-[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079.svg)](https://github.com/semantic-release/semantic-release)
+[![Code Style: Google](https://img.shields.io/badge/code%20style-google-blueviolet)](https://github.com/google/gts)
+[![semantic-release](https://img.shields.io/badge/%20%20%F0%9F%93%A6%F0%9F%9A%80-semantic--release-e10079)](https://github.com/semantic-release/semantic-release)
 
 
 Behold my latest inator! The `linkinator` provides an API and CLI for crawling websites and validating links.  It's got a ton of sweet features: