New features
[794186d] Display a gray separator line with menu sections (@seb-jean)
[dd7f6ca] Allow to use arrays in routing controller configuration (@edefimov)
[e63f66a] Tweaked a template to easy the integration with VueJS (@mneuhaus)
Bug fixes
[4c4ca86] Inject delete form action on detail pages (@notFloran)
[78f5603] Display UNKNOWN country flags properly when using Alpha3 format (Nicolas Bustos, @jnbustosr)
[2eb9d74] Add missing isPropagationStopped to BeforeEntityDeletedEvent (@notFloran)
[e868c25] Add symfony/deprecation-contracts to dependencies (@Warxcell)
[ca1f598] Fix bug absolute upload dir on Windows (@matthieumota)
[092bdfb] Fixe the upload file logic for files stores outside of the upload directory (@fantidev)