Project status and update suggestions

[flohw]

Hi,

I don't see a lot of activities on the project but I have some minor deprecation (mainly adding @return or return type to add)

It's not an absolute requirement but could be nice to prevent developer questions.

Additionally, now that Symfony supports php configuration we could migrate from yaml to php configuration and upgrade php minimal requirement as the vcard library supports from 7.3 the bundle could also be updated with this same version and php 5 is not supported any more.

What do you think? I can make a PR if you agree.

Thanks

[EDIT]: after some minor investigation the vcard library with version 1.5 supports php 5.3. As this version is not supported anymore we could update the minimal version of the library in the process.

[flohw]

@jeroendesloovere Do you have some info about this ?