Update submodules

M  .oh-my-zsh
M  .vim/bundle/vim-fugitive
M  .vim/bundle/vim-mustache-handlebars

Automatically generated:
  source: .shell/funcs:update_submodules()
  time:   Tue 31 Jul 09:53:53 BST 2018
  host:   BTH-tower01.actual-experience.com