move to GH Actions

.github/workflows/tests.yml

@@ -0,0 +1,25 @@
+name: tests
+
+on: [push, pull_request]
+
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        strategy:
+            fail-fast: false
+            matrix:
+                go: [1.8, 1.9, "1.10", 1.11, 1.12, 1.13, 1.14, 1.15]
+
+        steps:
+            - name: setup Go
+              uses: actions/setup-go@v2
+              with:
+                  go-version: ${{ matrix.go }}
+
+            - uses: actions/checkout@v2
+            - name: resolve dependencies
+              run: go get -v -t -d ./...
+            - name: build
+              run: go build -v .
+            - name: test
+              run: go test -v .