readme: compatible with PHP 7.3

Author: dg

composer.json

@@ -1,6 +1,6 @@
 {
 	"name": "nette/php-generator",
-	"description": "🐘 Nette PHP Generator: generates neat PHP code for you. Supports new PHP 7.2 features.",
+	"description": "🐘 Nette PHP Generator: generates neat PHP code for you. Supports new PHP 7.3 features.",
 	"keywords": ["nette", "php", "code", "scaffolding"],
 	"homepage": "https://nette.org",
 	"license": ["BSD-3-Clause", "GPL-2.0", "GPL-3.0"],

readme.md

@@ -27,9 +27,9 @@ The recommended way to install is via Composer:
 composer require nette/php-generator
 ```
 
-- v2.6 requires PHP 5.6 or newer (is compatible up to 7.2)
-- v3.0 requires PHP 7.0 or newer (is compatible up to 7.2)
-- v3.1 requires PHP 7.1 or newer (is compatible up to 7.2)
+- v3.1 requires PHP 7.1 or newer (is compatible up to 7.3)
+- v3.0 requires PHP 7.0 or newer (is compatible up to 7.3)
+- v2.6 requires PHP 5.6 or newer (is compatible up to 7.3)
 
 
 Usage
@@ -118,7 +118,7 @@ It results in:
 
 If the property, constant, method or parameter already exist, it will be overwritten.
 
-PHP Generator supports all new PHP 7.2 features:
+PHP Generator supports all new PHP 7.3 features:
 
 ```php
 $class = new Nette\PhpGenerator\ClassType('Demo');