Drop support for Go 1.20 and add support for Go 1.22

Also update golangci-lint from 1.55.2 to 1.57.1

.github/workflows/go.yml

@@ -9,29 +9,29 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    
+
     strategy:
       matrix:
-        go: [ '1.20', '1.21' ]
-        
+        go: [ '1.21', '1.22' ]
+
     name: Go ${{ matrix.go }}
-    
+
     steps:
     - uses: actions/checkout@v4
 
     - name: Set up Go
       uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}
-        
+
     - name: golangci-lint
       uses: golangci/golangci-lint-action@v3
       with:
-        version: v1.55.2
+        version: v1.57.1
 
     - name: Test
       run: go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
-      
+
     - name: Send coverage to Coveralls
       uses: shogo82148/actions-goveralls@v1
       with:

README.md

@@ -1,6 +1,6 @@
 # dktest
 
-![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/dhui/dktest/go.yml?branch=master) [![Coverage Status](https://img.shields.io/coveralls/github/dhui/dktest/master.svg)](https://coveralls.io/github/dhui/dktest?branch=master) [![GoDoc](https://godoc.org/github.com/dhui/dktest?status.svg)](https://godoc.org/github.com/dhui/dktest) [![Go Report Card](https://goreportcard.com/badge/github.com/dhui/dktest)](https://goreportcard.com/report/github.com/dhui/dktest) [![GitHub Release](https://img.shields.io/github/release/dhui/dktest/all.svg)](https://github.com/dhui/dktest/releases) ![Supported Go versions](https://img.shields.io/badge/Go-1.20%2C%201.21-lightgrey.svg)
+![GitHub Workflow Status (branch)](https://img.shields.io/github/actions/workflow/status/dhui/dktest/go.yml?branch=master) [![Coverage Status](https://img.shields.io/coveralls/github/dhui/dktest/master.svg)](https://coveralls.io/github/dhui/dktest?branch=master) [![GoDoc](https://godoc.org/github.com/dhui/dktest?status.svg)](https://godoc.org/github.com/dhui/dktest) [![Go Report Card](https://goreportcard.com/badge/github.com/dhui/dktest)](https://goreportcard.com/report/github.com/dhui/dktest) [![GitHub Release](https://img.shields.io/github/release/dhui/dktest/all.svg)](https://github.com/dhui/dktest/releases) ![Supported Go versions](https://img.shields.io/badge/Go-1.21%2C%201.22-lightgrey.svg)
 
 `dktest` is short for **d**oc**k**er**test**.