update github actions config

- combine windows and linux configs into a single matrix, now that
  actions/cache handles file paths properly
- update to latest actions/checkout and codecov actions

.github/workflows/tests.yml

@@ -4,66 +4,50 @@ env:
   GO111MODULE: on
 
 jobs:
-  linux:
+  test:
     strategy:
       matrix:
         go-version: [1.x, 1.12.x]
-    runs-on: ubuntu-latest
+        platform: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.platform }}
 
     steps:
     - uses: actions/setup-go@v1
       with:
         go-version: ${{ matrix.go-version }}
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
 
     - name: Cache go modules
-      uses: actions/cache@preview
+      uses: actions/cache@v1
       with:
         path: ~/go/pkg/mod
         key: ${{ runner.os }}-go-${{ hashFiles('go.sum') }}
         restore-keys: ${{ runner.os }}-go-
 
     - name: Run go fmt
+      if: runner.os != 'Windows'
       run: diff -u <(echo -n) <(gofmt -d -s .)
 
     - name: Ensure go generate produces a zero diff
+      shell: bash
       run:  go generate -x ./... && git diff --exit-code; code=$?; git checkout -- .; (exit $code)
 
     - name: Run go vet
       run: go vet ./...
 
     - name: Run go test
-      run: go test -v -race -coverprofile=coverage.txt -covermode=atomic ./...
+      run: go test -v -race -coverprofile coverage.txt -covermode atomic ./...
 
     - name: Ensure integration tests build
       # don't actually run tests since they hit live GitHub API
       run: go test -v -tags=integration -run=^$ ./test/integration
 
     - name: Run scrape tests
-      run: cd scrape && go test ./...
+      run: |
+        cd scrape
+        go test ./...
 
     - name: Upload coverage to Codecov
-      env:
-        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-      run: bash <(curl -s https://codecov.io/bash)
-
-  # On Windows, just run the local tests.  Don't bother with checking gofmt, go
-  # vet, or uploading results to Codecov
-  windows:
-    strategy:
-      matrix:
-        go-version: [1.x, 1.12.x]
-    runs-on: windows-latest
-
-    steps:
-    - uses: actions/setup-go@v1
+      uses: codecov/codecov-action@v1
       with:
-        go-version: ${{ matrix.go-version }}
-    - uses: actions/checkout@v1
-    - name: Cache go modules
-      uses: actions/cache@preview
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('go.sum') }}
-        restore-keys: ${{ runner.os }}-go-
-    - run: go test ./...
+        token: ${{ secrets.CODECOV_TOKEN }}