Try testing multiple Go versions.

.github/workflows/go.yml

@@ -13,15 +13,19 @@ jobs:
 
   build:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        go-version: [ '1.21.x', '1.20.x' ]
+
     steps:
     - uses: actions/checkout@v3
       with:
         lfs: 'true'
 
-    - name: Set up Go
+    - name: Set up Go ${{ matrix.go-version }}
       uses: actions/setup-go@v4
       with:
-        go-version: '1.21'
+        go-version: ${{ matrix.go-version }}
 
     - name: Run golangci-lint
       uses: golangci/golangci-lint-action@v3.7.0

README.md

@@ -129,6 +129,7 @@ go generate ./...
 go test ./...
 # Or to test some important parts with helpful information printed:
 go test -v github.com/corywalker/expreduce/expreduce -count=1
+# To exit early, press Ctrl-\
 ```
 
 The use of `go generate` might require the download of additional dependencies, for example `go install github.com/go-bindata/go-bindata/...@latest`.