feat: default to vim.snippet for snippet expansion if available (#1820)

README.md

@@ -68,6 +68,7 @@ lua <<EOF
         -- require('luasnip').lsp_expand(args.body) -- For `luasnip` users.
         -- require('snippy').expand_snippet(args.body) -- For `snippy` users.
         -- vim.fn["UltiSnips#Anon"](args.body) -- For `ultisnips` users.
+        -- vim.snippet.expand(args.body) -- For native neovim snippets (Neovim v0.10+)
       end,
     },
     window = {