v1.0-rc9

What's Changed

• Move base image into a separate github repository to speed up release building by @butschster in #64
• Adds method to get current app version by @butschster in #65
• 413 request entity too large by @FluffyDiscord in #66
• Updates composer by @butschster in #68
• Downloads centrifugo binary from a docker container by @butschster in #69
• Maintenance/update composer by @butschster in #70

New Contributors

• @FluffyDiscord made their first contribution in #66

Full Changelog: 1.0-rc.6...1.0-rc9