* 3.4:
Use the real image URL for the filesystem tests
[Finder] Update PHPdoc append()
[DI] Fix phpdoc
Fix code examples in PHPDoc
[HttpKernel] Fix inheritdocs
bumped Symfony version to 3.4.16
updated VERSION for 3.4.15
updated CHANGELOG for 3.4.15
* 2.8:
Use the real image URL for the filesystem tests
[Finder] Update PHPdoc append()
[DI] Fix phpdoc
Fix code examples in PHPDoc
[HttpKernel] Fix inheritdocs