switch CI to GitHub Actions

Author: vtjnash

.github/workflows/CI.yml

@@ -0,0 +1,46 @@
+name: CI
+on:
+  pull_request:
+    branches:
+      - master
+  push:
+    branches:
+      - master
+    tags: '*'
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.0'
+          - '1'
+          - 'nightly'
+        os:
+          - ubuntu-latest
+        arch:
+          - x64
+        include:
+          - version: '1'
+            os: ubuntu-latest
+            arch: x86
+          - version: '1'
+            os: windows-latest
+            arch: x64
+          - version: '1'
+            os: macos-latest
+            arch: x64
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info

.travis.yml

@@ -2,8 +2,7 @@
 
 This package provides for parsing and printing JSON in pure Julia.
 
-[![Build Status](https://travis-ci.org/JuliaIO/JSON.jl.svg)](https://travis-ci.org/JuliaIO/JSON.jl)
-[![Build status](https://ci.appveyor.com/api/projects/status/2sfomjwl29k6y6oy)](https://ci.appveyor.com/project/staticfloat/json-jl)
+[![Build Status](https://github.com/JuliaIO/JSON.jl/workflows/CI/badge.svg)](https://github.com/JuliaIO/JSON.jl/actions/workflows/CI.yml?query=branch%3Amaster)
 [![codecov.io](http://codecov.io/github/JuliaIO/JSON.jl/coverage.svg?branch=master)](http://codecov.io/github/JuliaIO/JSON.jl?branch=master)
 
 ## Installation