update README.md for bower install
update README.md for bower install

camsong/fetch-ie8,bmakuh/fetch,undoZen/fetch,pluma/fetch,othree/fetch,undoZen/fetch,undoZen/fetch,pluma/fetch,bmakuh/fetch,pluma/fetch,othree/fetch,undoZen/fetch,camsong/fetch-ie8,bmakuh/fetch,bmakuh/fetch,pluma/fetch,camsong/fetch-ie8,othree/fetch,othree/fetch,camsong/fetch-ie8