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- Add PHP.Barcelona 2019 to the conferences list

You can view the Pull Request on github:
<a href="https://github.com/php/web-php/pull/264" title="https://github.com/php/web-php/pull/264">https://github.com/php/web-php/pull/264</a>

Opened By: theUniC
Pull Request Description:
Hi,

This is a PR to add PHP.Barcelona 2019 to the conferences list.

Thanks!
Christian.