all: add Go 1.21, drop 1.19

.github/workflows/test.yml

@@ -4,7 +4,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.19.x, 1.20.x]
+        go-version: [1.20.x, 1.21.x]
         os: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:
@@ -28,17 +28,17 @@ jobs:
 
     # Static checks from this point forward. Only run on one Go version and on
     # Linux, since it's the fastest platform, and the tools behave the same.
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.21.x'
       run: diff <(echo -n) <(gofmt -s -d .)
-    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.20.x'
+    - if: matrix.os == 'ubuntu-latest' && matrix.go-version == '1.21.x'
       run: go vet ./...
 
   test-linux-alpine:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v3
     - name: Test as root, without cgo, and with busybox
-      run: docker run -v="$PWD:/pwd" -w=/pwd -e=CGO_ENABLED=0 golang:1.20.2-alpine go test ./...
+      run: docker run -v="$PWD:/pwd" -w=/pwd -e=CGO_ENABLED=0 golang:1.21.0-alpine go test ./...
 
   docker:
     name: Build and test Docker images

README.md

@@ -3,7 +3,7 @@
 [![Go Reference](https://pkg.go.dev/badge/mvdan.cc/sh/v3.svg)](https://pkg.go.dev/mvdan.cc/sh/v3)
 
 A shell parser, formatter, and interpreter. Supports [POSIX Shell], [Bash], and
-[mksh]. Requires Go 1.19 or later.
+[mksh]. Requires Go 1.20 or later.
 
 ### Quick start
 

cmd/shfmt/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.20.5-alpine AS build
+FROM golang:1.21.0-alpine AS build
 
 WORKDIR /src
 RUN apk add --no-cache git

go.mod

@@ -1,6 +1,6 @@
 module mvdan.cc/sh/v3
 
-go 1.19
+go 1.20
 
 require (
 	github.com/creack/pty v1.1.18