Gotop on alpine can't use busybox ps

[maxice8]

Required information:

• gotop version (gotop -V): 3.0.0
• The output of uname -a: Linux Impreza 4.19.34-0-vanilla Increase height of sparkline to match widget height #1-Alpine SMP Mon Apr 8 06:03:08 UTC 2019 x86_64 Linux
• Terminal emulator (e.g. iTerm or gnome terminal): Alacritty
• Any relevenat hardware info: None
• tmux version if using tmux: No

Also please copy or attach ~/.local/state/gotop/errors.log if it exists and contains logs:

13:15:31 proc_linux.go:14: failed to retrieve processes: failed to execute 'ps' command: exit status 1
13:15:32 proc_linux.go:14: failed to retrieve processes: failed to execute 'ps' command: exit status 1

[maxice8]

Very similar to #134 but i didn't put it there since one is FreeBSD and the other is Alpine Linux

[maxice8]

Installing procps which provides a widely used ps works around it. but it would be nice if it worked with the busybox ps.

[cjbassi]

Duplicate of #110, but thanks for the addition information. This gave me some new ideas which I'll post in that issue.