Update submodules

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

Automatically generated:
  source: Gitlab CI
  runner: dex.kodo.org.uk/1 (11.9.2)
  job:    https://code.kodo.org.uk/dom/dotfiles/-/jobs/800 (#800)
  time:   Sun May  5 04:26:45 UTC 2019