use inline type annotations.

Author: roachsinai

ftplugin/python/vim-pyannotate.vim

@@ -32,7 +32,7 @@ let l:prefix = get(g:, 'project_virtual_env', '')
 call system(l:prefix . '/bin/python -B ' . l:annotate_dir . '/driver.py')
 
 let l:pyannotate_binary = get(g:, 'pyannotate_use_env', v:false)? l:prefix . '/bin/pyannotate' : 'pyannotate'
-let l:output = system(l:pyannotate_binary . ' --type-info=' . l:info_file . ' -w ' . expand('%'))
+let l:output = system(l:pyannotate_binary . ' --py3 --type-info=' . l:info_file . ' -w ' . expand('%'))
 echo l:output
 exec ":edit"
 endfunction