Deprecated settings in deoplete plugin

Hi I forked your project and found that the following deoplete's settings in `plugins.programming.vim` are deprecated:
```vim
" When a capital letter is included in input, does not ignore
let g:deoplete#enable_smart_case=1
" Set the number of the input completion at the time of key input
let g:deoplete#auto_complete_start_length=2
" Set the limit of candidates
let g:deoplete#max_list=32
```

And, here is my solution:
```vim
autocmd VimEnter * call deoplete#custom#option({
\ 'smart_case': v:true,
\ 'auto_complete_start_length': 2,
\ 'max_list': 32,
\ })

```

Open plugins.programming.vim and locate the three deprecated deoplete settings shown in the issue. Compare them with the proposed deoplete#custom#option configuration, then verify that the Vim configuration loads without deprecated settings and preserves the stated values.

Written by the indexing model from the issue text.