does not support symfony version 4

[afidosstar]

Problem 1
- Installation request for gamma/pushpin-bundle ^0.1.2 -> satisfiable by gamma/pushpin-bundle[v0.1.2].
- gamma/pushpin-bundle v0.1.2 requires symfony/framework-bundle ~2.3|~3.4 -> no matching package found.

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.

[Evgenas]

Thx for the report, I will take a look