v0.6
What's new:
- Significant performance improvements thanks to changes in Nvim-R's API
- Improve completion data (function and packages descriptions) and layout
- ncm-R is now more verbose when something goes horribly wrong, both in nvim and in the logs
- Big code refactoring
- User customization of the pop-up menu layout
- Better Windows support
- Added plugin help
- Many small bug fixes and improvements