Crash when issuing "help" command
I just rebuilt moe on a Ubuntu Aarch64 and on a NetBSD-current Amd64 machines. While 'nimble test' completed without errors, running simple ':help' crashes moe on both systems identically. Here is the truss before the crash, if it is of any use:

`/home/xci/src/moe/src/moe.nim(69) main
/home/xci/src/moe/src/moepkg/help.nim(284) helpMode
/home/xci/src/moe/src/moepkg/editorstatus.nim(531) update
/home/xci/src/moe/src/moepkg/editorview.nim(405) update
/home/xci/src/moe/src/moepkg/editorview.nim(339) writeAllLines
/home/xci/src/moe/src/moepkg/highlight.nim(23) []
/usr/pkg/nim/lib/system/fatal.nim(53) sysFatal
Error: unhandled exception: index -1 not in 0 .. 0 [IndexDefect]
06 moe      __wait450(0x2eff, 0x7f7ffff2d31c, 0x1, 0) = 0`

The terminal is left in a weird state; even 'stty sane' can't fully repair it; as I use tmux, I kill the frame and get a new one. 