Support PHP 8, drop versions below 7.2

.travis.yml

@@ -1,5 +1,8 @@
 language: php
 php:
-  - 7.0
+  - 7.2
+  - 7.3
+  - 7.4
+  - 8.0
 before_script: composer install
 script: vendor/bin/phpunit

README.md

@@ -8,6 +8,15 @@ This is a Laravel wrapper / bridge for the [Ably PHP](https://github.com/ably/ab
 
 The PHP client library currently targets the [Ably 1.1 client library specification](https://www.ably.io/documentation/client-lib-development-guide/features/). You can jump to the '[Known Limitations](#known-limitations)' section to see the features the PHP client library does not yet support or [view our client library SDKs feature support matrix](https://www.ably.io/download/sdk-feature-support-matrix) to see the list of all the available features.
 
+## Supported Platforms
+
+This SDK supports PHP 7.2+ and 8.0
+
+We regression-test the library against a selection of PHP versions (which will change over time, but usually consists of the versions that are supported upstream). Please refer to [the travis config](.travis.yml) for the set of versions that currently undergo CI testing.
+
+We'll happily support (and investigate reported problems with) any reasonably-widely-used PHP version.
+If you find any compatibility issues, please [do raise an issue](https://github.com/ably/ably-php-laravel/issues/new) in this repository or [contact Ably customer support](https://support.ably.io/) for advice.
+
 ## Known Limitations
 
 Currently, this SDK only supports [Ably REST](https://www.ably.io/documentation/rest). However, if you want to subscribe to events in PHP, you can use the [MQTT adapter](https://www.ably.io/documentation/mqtt) to implement [Ably's Realtime](https://www.ably.io/documentation/realtime) features in PHP. 
@@ -95,6 +104,7 @@ This library uses [semantic versioning](http://semver.org/). For each release, t
 * Visit https://github.com/ably/ably-php-laravel/tags and add release notes for the release including links to the changelog entry.
 * Visit https://packagist.org/packages/ably/ably-php-laravel, log in to Packagist, and click the "Update" button.
 
+
 ## License
 
 Copyright (c) 2017 Ably Real-time Ltd, Licensed under the Apache License, Version 2.0.  Refer to [LICENSE](LICENSE) for the license terms.

composer.json

@@ -11,8 +11,8 @@
         }
     ],
     "require": {
-        "php": ">=5.4",
-        "ably/ably-php": "~1.0.1",
+        "php": "^7.2 || ^8.0",
+        "ably/ably-php": "~1.1.4",
         "laravel/framework": ">=5.1.0"
     },
     "require-dev": {

tests/AblyLaravelTest.php

@@ -5,7 +5,7 @@ class AblyLaravelTest extends Orchestra\Testbench\TestCase
 {
     const TEST_KEY = 'unit.test:key';
 
-    public function setUp()
+    public function setUp(): void
     {
         parent::setUp();