ci: Use own action to setup go version

Author: pawndev

.github/workflows/go.yml

@@ -5,12 +5,14 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.20
+      - uses: actions/checkout@v3
+      - name: Get go mod info
+        id: gomod
+        uses: pawndev/go-modfile-information@v1.0.0
+      - name: Set up Go
         uses: actions/setup-go@v3
         with:
-          go-version: '^1.20'
-        id: go
-      - uses: actions/checkout@v3
+          go-version: '^${{ steps.gomod.outputs.go_version }}'
       - name: Build
         run: |
           go mod download

README.md

@@ -25,11 +25,13 @@ See the [examples](#examples) for how to use it
 
 ## Examples
 
+Or see [this workflow](https://github.com/pawndev/go-modfile-information/blob/main/.github/workflows/go.yml)
+
 ```yaml
     ...
     - name: Get go mod info
       id: gomod
-      uses: pawndev/go-modfile-information@v1
+      uses: pawndev/go-modfile-information@v1.0.0
       with:
         modfile: go.mod # optional default to `go.mod`
     - name: Print go mod information