Support PHP 8 and use GitHub actions for continuous integration (CI)

.gitattributes

@@ -1,6 +1,6 @@
 /.gitattributes export-ignore
+/.github/workflows/ export-ignore
 /.gitignore export-ignore
-/.travis.yml export-ignore
 /examples/ export-ignore
 /phpunit.xml.dist export-ignore
 /phpunit.xml.legacy export-ignore

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  PHPUnit:
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php:
+          - 8.0
+          - 7.4
+          - 7.3
+          - 7.2
+          - 7.1
+          - 7.0
+          - 5.6
+          - 5.5
+          - 5.4
+          - 5.3
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+      - run: composer install
+      - run: vendor/bin/phpunit --coverage-text
+        if: ${{ matrix.php >= 7.3 }}
+      - run: vendor/bin/phpunit --coverage-text -c phpunit.xml.legacy
+        if: ${{ matrix.php < 7.3 }}

README.md

@@ -1,4 +1,6 @@
-# clue/reactphp-docker [![Build Status](https://travis-ci.org/clue/reactphp-docker.svg?branch=master)](https://travis-ci.org/clue/reactphp-docker)
+# clue/reactphp-docker
+
+[![CI status](https://github.com/clue/reactphp-docker/workflows/CI/badge.svg)](https://github.com/clue/reactphp-docker/actions)
 
 Async, event-driven access to the [Docker Engine API](https://docs.docker.com/develop/sdk/), built on top of [ReactPHP](https://reactphp.org/).
 
@@ -363,7 +365,7 @@ $ composer require clue/docker-react:^1.2
 ```
 
 This project aims to run on any platform and thus does not require any PHP
-extensions and supports running on legacy PHP 5.3 through current PHP 7+.
+extensions and supports running on legacy PHP 5.3 through current PHP 8+.
 It's *highly recommended to use PHP 7+* for this project.
 
 ## Tests