upgrade deps to support php 8

.travis.yml

@@ -1,14 +1,15 @@
 language: php
 
 php:
-  - 7.0
-  - 7.1
+  - 7.3
+  - 7.4
+  - 8.0
 
 before_script:
   - 'composer install --dev --prefer-source'
 
-script: php test/test.php
+script: php -d xdebug.mode=coverage test/test.php
 
 after_script:
-  - if [ $(phpenv version-name) = "5.6" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
-  - if [ $(phpenv version-name) = "5.6" ]; then php ocular.phar code-coverage:upload --format=php-clover test/build/clover.xml; fi
+  - if [ $(phpenv version-name) = "7.4" ]; then wget https://scrutinizer-ci.com/ocular.phar; fi
+  - if [ $(phpenv version-name) = "7.4" ]; then php ocular.phar code-coverage:upload --format=php-clover test/build/clover.xml; fi

README.md

@@ -8,7 +8,7 @@ of dependency injection containers compliant with [container-interop](https://gi
 
 To upgrade between major releases, please see [UPGRADING.md](UPGRADING.md).
 
-[![PHP Version](https://img.shields.io/badge/php-7.0%2B-blue.svg)](https://packagist.org/packages/mindplay/middleman)
+[![PHP Version](https://img.shields.io/badge/php-7.3%2B-blue.svg)](https://packagist.org/packages/mindplay/middleman)
 [![Build Status](https://travis-ci.org/mindplay-dk/middleman.svg?branch=master)](https://travis-ci.org/mindplay-dk/middleman)
 [![Code Coverage](https://scrutinizer-ci.com/g/mindplay-dk/middleman/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/mindplay-dk/middleman/?branch=master)
 [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/mindplay-dk/middleman/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/mindplay-dk/middleman/?branch=master)

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": ">=7.0",
+        "php": "^7.3 || ^8.0",
         "psr/http-message": "^1.0",
         "psr/http-server-handler": "^1.0",
         "psr/http-server-middleware": "^1.0",
@@ -19,10 +19,10 @@
         "mindplay/readable": "^1"
     },
     "require-dev": {
-        "mindplay/testies": "^0.2.0",
-        "phpunit/php-code-coverage": "^2.2",
+        "mindplay/testies": "^1.0",
+        "phpunit/php-code-coverage": "^9.2.5",
         "container-interop/container-interop": "^1.2",
-        "mockery/mockery": "^0.9.4"
+        "nyholm/psr7": "^1.4"
     },
     "autoload": {
         "psr-4": {