upgrade version requirements / drop old support in exchange for

supporting new versions

add support for Laravel 6

add support for Lumen 5.5

version 1.3.0 supports Laravel 5.6

improve laravel 5.5 compatibility

add timestamp command line functionality

change requirement of dialog helper to question helper, loses autocom…

…plete functionality but works in laravel 5.2+

Merge pull request #46 from NicolasMahe/master

Fix compatibility with backup-manager v1.1.1

add compatibility for symfony process library 2 or 3