Add netrw to update script
Squashed 'bundle/netrw.vim/' content from commit 985e424

git-subtree-dir: bundle/netrw.vim
git-subtree-split: 985e4247629845556676e825feda7ecfb37ea73d
Merge commit '4cf0d193430bf601c359f72da86dffca0a0ac1ac' as 'bundle/netrw.vim'
Change netrw settings to use tree listing