Merge pull request #19 from weirdtales/master

add github action: vet and build

.github/workflows/vet-and-build.yml

@@ -0,0 +1,24 @@
+name: vet-and-build
+on: [push]
+jobs:
+  build:
+    name: build
+    runs-on: ubuntu-latest
+    steps:
+    - name: set up
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.13
+      id: go
+
+    - name: check out
+      uses: actions/checkout@v2
+    
+    - name: deps
+      run: go get -v -t -d ./...
+
+    - name: vet
+      run: go vet ./...
+
+    - name: build
+      run: go build