ftplugin(python): E16 fix, async keyword support for define (vim/vim#14751)
This change includes the following changes:
- Fix "E16: Invalid range" when using a count with jump to start/end of class/method
- Update define with optional async keyword
- Update maintainer email
86f6e2c2ee
Co-authored-by: Tom Picton <tom@tompicton.com>