Notes in README about installation/update using Vundle
Notes in README about installation/update using Vundle

Inserts a couple of notes about Vundle working just fine for bundle-based
installs, and how to update using its :BundleUpdate command.

hacpai/dotfile,lmtim/dotfile,lmtim/dotfile,JohnHwee/dotfile,henry-zhuang/dotfile