chore: use GitHub actions for test

This is in addition to TravisCI for the purpose of comparing them

.github/workflows/test.yml

@@ -0,0 +1,19 @@
+name: test
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        version: [ '1.15', '1.16' ]
+    name: Go ${{ matrix.version }}
+    steps:
+    - uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.version }}
+    - uses: actions/checkout@v2
+    - run: go mod tidy && git diff --exit-code go.mod go.sum
+    - run: go vet ./...
+    - run: go run ./ginkgo -r --randomizeAllSpecs --randomizeSuites --race --trace

README.md

@@ -1,6 +1,7 @@
 ![Ginkgo: A Go BDD Testing Framework](https://onsi.github.io/ginkgo/images/ginkgo.png)
 
 [![Build Status](https://travis-ci.org/onsi/ginkgo.svg?branch=master)](https://travis-ci.org/onsi/ginkgo)
+[![test](https://github.com/onsi/ginkgo/workflows/test/badge.svg?branch=master)](https://github.com/onsi/ginkgo/actions?query=workflow%3Atest+branch%3Amaster)
 
 Jump to the [docs](https://onsi.github.io/ginkgo/) | [中文文档](https://ke-chain.github.io/ginkgodoc) to learn more.  To start rolling your Ginkgo tests *now* [keep reading](#set-me-up)!