This release was tested against PHP 7.2, improves the CI and testing setup
and improves the displayed version for the root package by using the package
pretty version rather than an unresolved one.

Total issues resolved: 5

• 49: Update to PHPUnit 6 thanks to @carusogabriel
• 50: Add PHP 7.2 to Travis matrix thanks to @Jean85
• 51: Uniform version style for root package thanks to @Jean85
• 52: Root package version show normalized in a version-branch thanks to @Jean85