docs: add CI badge

Akagi201 · Akagi201 · commit bd849da0b7ca · 2022-01-31T20:07:00.000+08:00
diff --git a/README.md b/README.md
@@ -1,5 +1,7 @@
 # utils-go
 
+![CI Status](https://github.com/Akagi201/utils-go/actions/workflows/golangci-lint.yml/badge.svg?branch=master)
+
 Some awesome go utils.
 
   > I am changing the code all the time, do not use it directly, fork it!
