I don't know if it is possible, I searched all over the docs. I tried:
let g:completion_enable_snippet = ['UltiSnips', 'vim-vsnip']
and this obviously shows an error, also tried
let g:completion_enable_snippet = 'UltiSnips'
let g:completion_enable_snippet = 'vim-vsnip'
also didn't work, and tried:
let g:completion_enable_snippet = 'UltiSnips'
let g:completion_enable_snippet += 'vim-vsnip'
I don't know if it is possible, I searched all over the docs. I tried:
let g:completion_enable_snippet = ['UltiSnips', 'vim-vsnip']
and this obviously shows an error, also triedalso didn't work, and tried:
and didn't work :(