Update submodules

M  .oh-my-zsh
M  .vim/bundle/vim-fugitive
M  .vim/bundle/vim-javascript

Automatically generated:
  source: .shell/funcs:update_submodules()
  time:   Mon 28 May 12:47:47 BST 2018
  host:   1-gw1.net.kodo.org.uk