Create ci.yml (#1741)

This PR enabled GitHub Actions as a replacement to TravisCI. I'm a fan of removing external dependencies where possible, and GitHub Actions has matured to be really useful.

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: Go
+on: [push]
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        goVer: [1.11, 1.12, 1.13]
+
+    steps:
+    - name: Set up Go ${{ matrix.goVer }}
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.goVer }}
+      id: go
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v2
+
+    - name: Get dependencies
+      run: |
+        go get -v -t -d ./...
+        go get gopkg.in/check.v1
+
+    - name: Build
+      run: go build -v .
+    
+    - name: Format
+      run: diff -u <(echo -n) <(gofmt -d .)
+    
+    - name: Test
+      run: go test -v ./...

.travis.yml

@@ -1,18 +0,0 @@
-language: go
-sudo: false
-
-go:
-  - "1.10"
-  - 1.11
-  - 1.12
-  - 1.13
-  - tip
-
-install:
-  - go get -d -v ./... && go build -v ./...
-  - go get gopkg.in/check.v1
-  - go get github.com/stretchr/testify
-
-script:
-  - diff -u <(echo -n) <(gofmt -d .)
-  - go test -v ./...