add mit license badge in readme

README.md

@@ -1,6 +1,6 @@
 # Uptime Kuma
 
-<a target="_blank" href="https://github.com/louislam/uptime-kuma"><img src="https://img.shields.io/github/stars/louislam/uptime-kuma" /></a> <a target="_blank" href="https://hub.docker.com/r/louislam/uptime-kuma"><img src="https://img.shields.io/docker/pulls/louislam/uptime-kuma" /></a> <a target="_blank" href="https://hub.docker.com/r/louislam/uptime-kuma"><img src="https://img.shields.io/docker/v/louislam/uptime-kuma/latest?label=docker%20image%20ver." /></a> <a target="_blank" href="https://github.com/louislam/uptime-kuma"><img src="https://img.shields.io/github/last-commit/louislam/uptime-kuma" /></a>
+<a target="_blank" href="https://github.com/louislam/uptime-kuma"><img src="https://img.shields.io/github/stars/louislam/uptime-kuma" /></a> <a target="_blank" href="https://hub.docker.com/r/louislam/uptime-kuma"><img src="https://img.shields.io/docker/pulls/louislam/uptime-kuma" /></a> <a target="_blank" href="https://hub.docker.com/r/louislam/uptime-kuma"><img src="https://img.shields.io/docker/v/louislam/uptime-kuma/latest?label=docker%20image%20ver." /></a> <a target="_blank" href="https://github.com/louislam/uptime-kuma"><img src="https://img.shields.io/github/last-commit/louislam/uptime-kuma" /></a> <img alt="GitHub" src="https://img.shields.io/github/license/louislam/uptime-kuma">
 
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     <img src="./public/icon.svg" width="128" alt="" />