Need help with vim-plug

I'd like to switch from vundle to vim-plug for managing plugins. I copied the vim-plug script and pasted it into ~.vim/autoload. I put the following at the top of my .vimrc:

call plug#begin(~/.vim/plugged')

Plug 'xolox/vim-misc'
Plug 'xolox/vim-session'
Plug 'xolox/vim-notes'
Plug 'davidoc/taskpaper.vim'
Plug 'vimwiki/vimwiki'
Plug 'junegunn/vim-plug'

" Initialize plugin system
call plug