migrate to github actions

Author: Emily Zhang

.github/workflows/build.yml

@@ -0,0 +1,12 @@
+name: Build
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - uses: actions/setup-go@v1
+      with:
+        go-version: '1.13.x' # The Go version to download (if necessary) and use.
+    - run: make deps build test

.travis.yml

@@ -0,0 +1,13 @@
+.PHONY: build deps test
+
+export GO111MODULE=on
+
+build:
+	go build ./...
+
+deps:
+	go mod verify
+	go mod tidy
+
+test:
+	go test -v ./...