Fix link to vim.org in README
Fix link to vim.org in README

Fixes #217
ppslinux/Vundle.vim,TLmaK0/my_vim_config,ppslinux/Vundle.vim,omalsa04/dotfiles,kotamat/vundle,kotamat/vundle,ppslinux/Vundle.vim,ppslinux/Vundle.vim,kotamat/vundle,kotamat/vundle,kotamat/vundle,stephaneliu/dotfiles,omalsa04/dotfiles,ppslinux/Vundle.vim,ppslinux/Vundle.vim,stephaneliu/dotfiles,sensorario/Vundle.vim