doc: readme updated with renameDestDir info
doc: readme updated with renameDestDir info

jg3526/multer,ACT1GMR/multer,hwqin/multer,xixilive/multer,dustin-H/multer,wowzzangga/multer,zhaoshiling1017/multer,jacobtomlinson/multer,ramanujadasu/multer,kylev/multer,mixxen/multer,expressjs/multer,kangkot/multer,tchungdojo/multer