Add github actions

.github/workflows/build.yml

@@ -0,0 +1,17 @@
+name: Build and test
+on: [ push ]
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-go@v2
+        with:
+          go-version: '^1.15' # The Go version to download (if necessary) and use.
+      - run: go test -race -coverprofile=coverage.txt -coverpkg=./... -covermode=atomic ./...
+      - uses: codecov/codecov-action@v1
+        with:
+          file: coverage.txt