1.6.0

Improvements:
- Added GoyoEnter / GoyoLeave events to be used instead of g:goyo_callbacks
- Cursor position is retained on close (#27)
- Goyo will make sure that you can't put cursor on the surrounding pad windows
- Now toggles vim-signify as well
- Added `Goyo!` command for turning it off

Fixes:
- Fixed winminwidth issue (#35)

Fix #25: Statusline visibility on urxvt