introduce github actions

.github/FUNDING.yml

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+github: [motemen, Songmu]

.github/workflows/release.yaml

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+name: release
+on:
+  push:
+    tags:
+    - "v[0-9]+.[0-9]+.[0-9]+"
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+    - name: setup go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.x
+    - name: checkout
+      uses: actions/checkout@v1
+    - name: release
+      env:
+        GITHUB_TOKEN: ${{ secrets.github_token }}
+      run: |
+        export GOBIN=$(pwd)/bin
+        PATH=$GOBIN:$PATH make crossbuild upload

.github/workflows/test.yaml

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+name: test
+on:
+  push:
+    branches:
+    - "**"
+  pull_request: {}
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-latest
+        - macOS-latest
+        - windows-latest
+    steps:
+    - name: setup go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.x
+    - name: checkout
+      uses: actions/checkout@v1
+    - name: lint
+      run: |
+        GO111MODULE=off GOBIN=$(pwd)/bin go get golang.org/x/lint/golint
+        bin/golint -set_exit_status ./...
+      if: "matrix.os == 'ubuntu-latest' || matrix.os == 'macOS-latest'"
+    - name: test
+      run: go test -coverprofile coverage.out -covermode atomic ./...
+    - name: Send coverage
+      uses: shogo82148/actions-goveralls@v1
+      with:
+        github-token: ${{ secrets.github_token }}
+        path-to-profile: coverage.out
+        parallel: true
+        job-number: ${{ strategy.job-index }}
+  finish:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+    - name: finish coverage report
+      uses: shogo82148/actions-goveralls@v1
+      with:
+        github-token: ${{ secrets.github_token }}
+        parallel-finished: true