Use GitHub actions for continuous integration (CI)

.gitattributes

@@ -0,0 +1,6 @@
+/.gitattributes export-ignore
+/.github/workflows export-ignore
+/.gitignore export-ignore
+/examples/ export-ignore
+/phpunit.xml.dist export-ignore
+/tests/ export-ignore

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  PHPUnit:
+    name: PHPUnit (PHP ${{ matrix.php }})
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php:
+          - 7.3
+          - 7.2
+          - 7.1
+          - 7.0
+          - 5.6
+          - 5.5
+          - 5.4
+          - 5.3
+    steps:
+      - uses: actions/checkout@v2
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+      - run: composer install
+      - run: vendor/bin/phpunit --coverage-text

.gitignore

@@ -1,2 +1,2 @@
-/vendor
 /composer.lock
+/vendor/

README.md

@@ -1,4 +1,6 @@
-# clue/sse-react [![Build Status](https://travis-ci.org/clue/php-sse-react.svg?branch=master)](https://travis-ci.org/clue/php-sse-react)
+# clue/sse-react
+
+[![CI status](https://github.com/clue/php-sse-react/workflows/CI/badge.svg)](https://github.com/clue/php-sse-react/actions)
 
 Streaming, async HTML5 Server-Sent Events server (aka. SSE or EventSource), built on top of [React PHP](http://reactphp.org/).