update CI

Author: mcuadros

.github/workflows/test.yml

@@ -0,0 +1,14 @@
+on: [push, pull_request]
+name: Test
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.14.x
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Test
+      run: go test ./...

.travis.yml

@@ -1,4 +1,4 @@
-go-defaults [![Build Status](https://travis-ci.org/mcuadros/go-defaults.png?branch=master)](https://travis-ci.org/mcuadros/go-defaults) [![GoDoc](http://godoc.org/github.com/mcuadros/go-defaults?status.png)](http://godoc.org/github.com/mcuadros/go-defaults) [![GitHub release](https://img.shields.io/github/release/mcuadros/go-defaults.svg)](https://github.com/mcuadros/go-defaults/releases)
+go-defaults [![Build Status](https://img.shields.io/github/workflow/status/mcuadros/go-defaults/Test.svg)](https://github.com/mcuadros/go-defaults/actions) [![GoDoc](http://godoc.org/github.com/mcuadros/go-defaults?status.png)](https://pkg.go.dev/github.com/mcuadros/go-defaults) [![GitHub release](https://img.shields.io/github/release/mcuadros/go-defaults.svg)](https://github.com/mcuadros/go-defaults/releases)
 ==============================
 
 Enabling stuctures with defaults values using [struct tags](http://golang.org/pkg/reflect/#StructTag).