3.2.0

This release introduces PHP 7.3 support, reduces the exported package size,
and improves the overall code quality of the package through updated coding
style conventions.

Total issues resolved: 6

• 440: Test failures under PHP 7.3 thanks to @Majkl578
• 450: PHP_Parser v4 introduces a string type declaration on a parameter, breaking PHP 7.1 installations thanks to @Ocramius
• 451: Remove .idea from .gitignore thanks to @Majkl578
• 452: Upgrade to Doctrine CS 5.0 thanks to @Majkl578
• 453: export-ignores, appveyor.yml -> .appveyor.yml thanks to @Majkl578
• 455: PHP 7.3 stub and PHP-Parser compatibility thanks to @paxal