Updated composer versions and re-added php 8

Author: lux

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
           - "7.2"
           - "7.3"
           - "7.4"
-          #- "8.0"
+          - "8.0"
 
         dependencies: [highest]
 

composer.json

@@ -13,11 +13,11 @@
 		}
 	],
 	"require": {
-		"psr/log": "1.*",
-		"php": ">=5.3.2"
+		"psr/log": "^1.0.1",
+		"php": ">=7.2"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "^4.8.36 || ^5.7 || ^6.5"
+		"phpunit/phpunit": "^8.5"
 	},
 	"autoload": {
 		"psr-0": {