update README for v4, update supported Golang versions

.github/workflows/tests.yml

@@ -8,18 +8,22 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [ '1.18', '1.19', '1.20' ]
+        go-version: [ '1.20', '1.21', '1.22' ]
 
     steps:
       - uses: actions/checkout@v3
+
       - name: Setup Go ${{ matrix.go-version }}
         uses: actions/setup-go@v3
         with:
           go-version: ${{ matrix.go-version }}
+
       - name: Build
         run: go build -v ./...
+
       - name: Test
         run: go test -coverprofile=coverage.txt -v ./...
+
       - name: Upload code coverage results
         uses: codecov/codecov-action@v3
         with:

README.md

@@ -9,7 +9,21 @@ The new home of Conversio's Shopify Go library.
 
 ## Supported Go Versions
 
-This library is tested automatically against the latest version of Go (currently 1.20) and the two previous versions (1.19, 1.18) but should also work with older versions.
+This library is tested automatically against the latest version of Go (currently 1.22) and the two previous versions (1.21, 1.20) but should also work with older versions.
+
+## Install v4
+
+```console
+$ go get github.com/bold-commerce/go-shopify/v4
+```
+
+## Use v4
+
+```go
+import "github.com/bold-commerce/go-shopify/v4"
+```
+
+This gives you access to the `goshopify` package.
 
 ## Install v3