Use standout/reverse instead of yellow for jediUsages
Use standout/reverse instead of yellow for jediUsages

It uses cterm=reverse, which is supported by current Neovim, and at
least for xterm and rxvt-unicode reverse and standout are the same.

See `infocmp`:

> smso=\E[7m / rev=\E[7m

davidhalter/jedi-vim