Supports php 8.0 (#47)

* Add php 8.0 into requirements

* Symfony 5. PHP 8

* php 8.0

* Symfony 4

* Update composer.json

* Update .travis.yml

Author: madmis

.travis.yml

@@ -5,10 +5,10 @@ cache:
     - $HOME/.composer/cache/files
 
 php:
-  - 7.1
   - 7.2
   - 7.3
   - 7.4
+  - 8.0
 
 before_script:
     - COMPOSER_ROOT_VERSION=dev-master composer --prefer-dist install

composer.json

@@ -15,12 +15,12 @@
 		"issues": "https://github.com/mac-cain13/daemonizable-command/issues"
 	},
 	"require": {
-		"php": "^7.1",
-		"symfony/console": "^4.0 || ^5.0",
-		"symfony/dependency-injection": "^4.0 || ^5.0"
+		"php": "^7.2|^8.0",
+		"symfony/console": "^4.0|^5.0",
+		"symfony/dependency-injection": "^4.0|^5.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^7.5.20 || ^8.0"
+		"phpunit/phpunit": "^8.0 || ^9.0"
 	},
 	"suggest": {
 		"symfony/filesystem": "If you can't use Upstart or systemd"