New features

[c6009c3] Update the application to Symfony 5.2 (@javiereguiluz) [1035980] Replaced return 0 with return Command::SUCCESS (@Coderberg) [bb3b183] Replace Travis and Appveyor by GitHub Actions (@javiereguiluz) [7f9f248] Updated JavaScript dependencies (@Coderberg)

Bug fixes

[fdeb741] Updated some setters in Post entity (@seb-jean)