Fix GitHub action (#1)

Author: barweiss

.github/workflows/go.yml

@@ -16,11 +16,15 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v2
       with:
-        stable: 'false'
-        go-version: 1.18beta1
+        go-version: 1.17
+
+    - name: Install Go 1.18
+      run: |
+        go install golang.org/dl/go1.18beta1@latest
+        go1.18beta1 download
 
     - name: Build
-      run: go build -v ./...
+      run: go1.18beta1 build -v ./...
 
     - name: Test
-      run: go test -v ./...
+      run: go1.18beta1 test -v ./...

README.md

@@ -1,5 +1,7 @@
 # go-tuple: Generic tuples for Go 1.18.
 
+[![Go](https://github.com/barweiss/go-tuple/actions/workflows/go.yml/badge.svg)](https://github.com/barweiss/go-tuple/actions/workflows/go.yml)
+
 Go 1.18 tuple implementation.
 
 Use tuples to store 1 or more values without needing to write a custom struct.