Symfony 5 support

[tourze]

I notice that the master branch has modified the composer.json, but that is not a new release on packagist.

[jeroendesloovere]

Same problem over here.

Context

• A symfony 5 application

  Problem 1

  • onurb/doctrine-yuml-bundle[1.1, ..., 1.1.6] require doctrine/common ~2.0 -> found doctrine/common[2.1.3, ..., 2.13.3] but these were not loaded, likely because it conflicts with another require.
  • Root composer.json requires onurb/doctrine-yuml-bundle ^1.1 -> satisfiable by onurb/doctrine-yuml-bundle[1.1, ..., 1.1.6].