Drop support for PHP 5.6, 7.0 and hhvm

Replace use of PHPUnit_Framework_Assert by PHPUnit\Framework\Assert.

Call $node->name->toString() since $node->name is now an
Identifier object (per PHP-Parser 4).

Do not add anonymous classes to the registry.

Replace $parameter->name by $parameter->var->name (per PHP-Parser 4).

Author: tomzx

.travis.yml

@@ -1,12 +1,9 @@
 language: php
 
 php:
-    - 5.6
-    - 7.0
-    - 7.1
     - 7.2
     - 7.3
-    - hhvm
+    - 7.4
 
 sudo: false
 

composer.json

@@ -20,17 +20,17 @@
 		"issues": "https://github.com/tomzx/php-semver-checker/issues"
 	},
 	"require": {
-		"php": ">=5.6.0",
+		"php": ">=7.2.29",
 
-		"hassankhan/config": "^0.11",
-		"nikic/php-parser": "^3.1",
-		"symfony/console": "^2.7|^3.0|^4.0",
-		"symfony/yaml": "^2.7|^3.0|^4.0",
+		"hassankhan/config": "^2.0",
+		"nikic/php-parser": "^4.0",
+		"symfony/console": "^4.0",
+		"symfony/yaml": "^4.0",
 		"tomzx/finder": "^0.1"
 	},
 	"require-dev": {
 		"mockery/mockery": "^1.0",
-		"phpunit/phpunit": "^4.0|^5.0"
+		"phpunit/phpunit": "^7.0|^8.0"
 	},
 	"bin": [
 		"bin/php-semver-checker"
@@ -47,7 +47,7 @@
 	},
 	"config": {
 		"platform": {
-			"php": "5.6.0"
+			"php": "7.2.29"
 		}
 	},
 	"extra": {