Update magento-semver to be compatible with PHP7.4

Author: fascinosum

composer.json

@@ -1,14 +1,14 @@
 {
     "name": "magento/magento-semver",
     "description": "Magento semantic version checker",
-    "version": "5.0.0",
+    "version": "6.0.0",
     "license": [
         "OSL-3.0",
         "AFL-3.0"
     ],
     "bin": ["bin/svc"],
     "require": {
-        "php": "~7.1.3||~7.2.0||~7.3.0||~7.4.0",
+        "php": "~7.2.29||~7.3.0||~7.4.0",
         "phpstan/phpdoc-parser": "^0.3.5",
         "symfony/console": "~4.1.0||~4.4.0",
         "tomzx/php-semver-checker": "^0.14.0",