feat: upgrade all dependencies for php8 and monolog version 3

Makefile

@@ -1,7 +1,7 @@
 .PHONY: all test composer clean clean-docker-image clean-composer-vendor
 
-composer = composer:1.9
-phpcli = php:7
+composer = composer:2
+phpcli = php:8
 
 all: composer test
 

README.md

@@ -44,7 +44,7 @@ $logger->debug('mylog');
 Execute it with the following docker command.
 
 ```
-docker run -it --rm -v "${PWD}":/usr/src/myapp -w /usr/src/myapp php:7-cli php test.php
+docker run -it --rm -v "${PWD}":/usr/src/myapp -w /usr/src/myapp php:8-cli php test.php
 ```
 
 You should see the log 'mylog' with debug level in the logdna account for which the ingestion key is bound to.
@@ -55,7 +55,9 @@ This project is licensed under LGPL3.0. See `LICENSE` file for details.
 
 ## Versions
 
-Version 1.x is php5 compatible version while 2.x is php7 and php8 since 2.2.
+1.x is php5 with monolog 1.
+2.x is php7 and php8 with monolog 2.
+3.x is php8 with monolog 3.
 
 ## Test
 

composer.json

@@ -12,11 +12,11 @@
         }
     ],
     "require": {
-        "php": "^7.2",
-        "monolog/monolog": ">=2.0"
+        "php": "^8.0",
+        "monolog/monolog": ">=3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.3"
+        "phpunit/phpunit": ">=8.3"
     },
     "autoload": {
         "psr-4": {"Zwijn\\Monolog\\": "src/Monolog"}