Funcref cannot be assigned to g:foldpeek#head

[aileot]

let g:foldpeek#head = funcref('<some-function>')

The script above throws E704: Funcref variable name must start with a capital: g:foldpeek#head. This is a problem on VimScript specifications so that it's impossible to deal with in the current option format of this plugin.

Rename all the variables like g:foldpeek#foo#bar_baz to g:foldpeek.foo.bar_baz.