tutor: Update vim-tutor to 0.2.1

Also, some tweaks based on input by @fdinoff on gitter.

runtime/ftplugin/tutor.vim

@@ -21,8 +21,9 @@ setlocal iskeyword=@,-,_
 
 setlocal foldmethod=expr
 setlocal foldexpr=tutor#TutorFolds()
-setlocal foldcolumn=3
+setlocal foldcolumn=1
 setlocal foldlevel=4
+setlocal nowrap
 
 setlocal statusline=%{toupper(expand('%:t:r'))}\ tutorial%=
 setlocal statusline+=%{tutor#InfoText()}