I changed this to be for Vundle as it is the most popular plugin manager right now (with 4577 stars). pathogen is close second (4340 stars), but I reason that users that use pathogen can figure out how to convert the installation instruction to git repos. I mention VAM as suggested alternative because it seems superior (I have never tried it though), but as it only has <10% of the stars of the others it seems silly to add instructions for it and not for the mainstream ones.