Add pathogen requirement to README

[krisleech]

This plugin requires pathogen to be installed because of pathogen#split(&rtp). The README reads like pathogen is used in the example to install the plugin but is not a hard requirement. If you agree I can submit a PR to adjust the README.

I use vundle to manage plugins and so this plugin does not work for me :(

[nerfologist]

+1

Edit: as a workaround, if you are using vundle, you can add this to your .vimrc:

let g:jasmine_directory = '/home/username/.vim/bundle/jasmine.vim'

This will skip the Pathogen-dependent code.
Adjust the path as needed.