ci: Test on Golang 1.21 & 1.20 (#167)

.github/workflows/build.yml

@@ -21,8 +21,8 @@ jobs:
       fail-fast: false
       matrix:
         go:
-          - '1.19'
           - '1.20'
+          - '1.21'
 
     permissions:
       checks: write

README.md

@@ -5,8 +5,8 @@
 [![Coverage Status](https://coveralls.io/repos/github/bodgit/sevenzip/badge.svg?branch=master)](https://coveralls.io/github/bodgit/sevenzip?branch=master)
 [![Go Report Card](https://goreportcard.com/badge/github.com/bodgit/sevenzip)](https://goreportcard.com/report/github.com/bodgit/sevenzip)
 [![GoDoc](https://godoc.org/github.com/bodgit/sevenzip?status.svg)](https://godoc.org/github.com/bodgit/sevenzip)
+![Go version](https://img.shields.io/badge/Go-1.21-brightgreen.svg)
 ![Go version](https://img.shields.io/badge/Go-1.20-brightgreen.svg)
-![Go version](https://img.shields.io/badge/Go-1.19-brightgreen.svg)
 
 # sevenzip