Migrate to GitHub Actions (#27)

* Change from Travis to GitHub Actions.
* Change from gox to goreleaser.
* Add .gitignore.

.github/workflows/ci.yml

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+name: continuous integration
+on: [push, pull_request]
+jobs:
+  test:
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+        go: [ '1.13.x', '1.14.x', '1.15.x' ]
+    runs-on: ${{ matrix.platform }}
+    name: Test (go ${{ matrix.go }}, ${{ matrix.platform }})
+    env:
+    - CGO_ENABLED=0
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go }}
+    - name: Run tests
+      run: go test -coverprofile=coverage.txt -covermode=atomic ./...
+      shell: bash
+    - name: Upload coverage
+      uses: codecov/codecov-action@v1
+      with:
+        files: coverage.txt
+        flags: ${{ matrix.go }},${{ matrix.platform }}
+  publish:
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: test
+    runs-on: ubuntu-latest
+    name: Publish
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 0
+    - name: Setup Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: '1.15.x'
+    - name: Run goreleaser
+      uses: goreleaser/goreleaser-action@v2
+      with:
+        version: latest
+        args: release --rm-dist
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+.gocompat.json
+dist

.goreleaser.yml

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+before:
+  hooks:
+  - go mod download
+builds:
+- id: default-build
+  main: ./cmd/gocompat/main.go
+  binary: gocompat
+  env:
+  - CGO_ENABLED=0
+  goos:
+  - linux
+  - windows
+  - darwin
+  goarch:
+  - '386'
+  - amd64
+  - arm64
+  mod_timestamp: '{{ .CommitTimestamp }}'
+archives:
+- id: default-archive
+  builds:
+  - default-build
+  format: tar.gz
+  format_overrides:
+  - goos: windows
+    format: zip
+checksum:
+  name_template: 'checksums.txt'
+snapshot:
+  name_template: "{{ .Tag }}-next"
+changelog:
+  sort: asc