add column width guide option

Author: petervlk

lua/options.lua

@@ -74,4 +74,7 @@ vim.o.scrolloff = 10
 -- See `:help 'confirm'`
 vim.o.confirm = true
 
+-- set width guide column at 100 characters
+vim.opt.colorcolumn = '100'
+
 -- vim: ts=2 sts=2 sw=2 et