Update 2.1.5.8

Hi everyone! we are happy to announce our last update before our final release!!!

Here are the fixes:

- YUR connection bug fix
- Performance/Bug Fixes
- Custom Stages <https://github.com/shogoki-vnz/SynthRiders-CustomStages>

As always we welcome your feedback and bug reports on our Official discord server. Please use #bugs-report to make sure that we see your feedback.