updated php-parser to 5.4.0

updated php-parser to version 4.13.

some other small fixes.

Merge branch 'php8'

fixed version number.

Updated php minimum version to 7.0.

Updated PHPUnit to 6.0.
Removed php 5.x support.

Merge pull request #82 from No-OBu/upd/php-parser-4.0

Update to the last version of PHP-Parser (4.0)

Version 0.6.0

* Exclude phpctags when re-building phar
* Fix typo in README.md
* Fixed PHPUnit.xml.dist
* Refactoring codebase
* Refactroing testsuite
* Now composer support an entry point to install in globally
* Define new build flow

Make it installable via composer (without generate phar)

Version 0.5.1

Version 0.5