clarify how to add custom parts to the statusline
clarify how to add custom parts to the statusline

bling/vim-airline,yzhou61/vim-airline,tschundler/dotfiles,vim-IDE/vim-airline,unphased/vim-airline,tschundler/dotfiles,mildred/vim-airline,chrisbra/vim-airline,blueyed/vim-airline,rchicoli/vim-airline,wilywampa/vim-airline,dalguji/vim-airline,HarmtH/vim-airline,sappo/vim-airline,tschundler/dotfiles