PR Actions (#65)

* Update ci.yml

* Update README.md

* Update ci.yml

.github/workflows/ci.yml

@@ -1,20 +1,26 @@
 name: CI
 
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - '*'
 
 jobs:
   build:
     name: MacOS
     runs-on: macOS-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Run tests
       run: make test-swift
 
   ubuntu:
     name: Ubuntu
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
     - name: Run tests
       run: make test-linux

README.md

@@ -1,8 +1,7 @@
 # 🗺 swift-html
 
-[![Swift 5](https://img.shields.io/badge/swift-5-ED523F.svg?style=flat)](https://swift.org/download/)
-[![Swift 4.2](https://img.shields.io/badge/swift-4.2-ED523F.svg?style=flat)](https://swift.org/download/)
-[![Build Status](https://img.shields.io/endpoint.svg?url=https%3A%2F%2Factions-badge.atrox.dev%2Fpointfreeco%2Fswift-html%2Fbadge&style=flat)](https://actions-badge.atrox.dev/pointfreeco/swift-html/goto)
+[![Swift 5.1](https://img.shields.io/badge/swift-5.1-ED523F.svg?style=flat)](https://swift.org/download/)
+[![CI](https://github.com/pointfreeco/swift-html/workflows/CI/badge.svg)](https://actions-badge.atrox.dev/pointfreeco/swift-html/goto)
 [![@pointfreeco](https://img.shields.io/badge/contact-@pointfreeco-5AA9E7.svg?style=flat)](https://twitter.com/pointfreeco)
 
 A Swift DSL for type-safe, extensible, and transformable HTML documents.