Change default plugin for Crystal for better performance
**What is language?**
Crystal

**Which platform does the language support?**

- [X] Linux
- [X] MacOS
- [X] Windows

**Any suggest vim plugins for this language?**
While SpaceVim already has support for Crystal, the default `vim-crystal` plugin is incredibly slow and lags while typing. I recommend changing the default plugin to [this version of vim-crystal](https://github.com/jlcrochet/vim-crystal), which is significantly faster.
