updated readme, new `->` syntax for js backend.
updated readme, new `->` syntax for js backend.

pombredanne/Rusthon,rootfs/Rusthon,pombredanne/Rusthon,rootfs/Rusthon,secureosv/pythia,rootfs/Rusthon,rootfs/Rusthon,pombredanne/Rusthon,pombredanne/Rusthon,rusthon/Rusthon,secureosv/pythia,rusthon/Rusthon,rusthon/Rusthon,secureosv/pythia,rootfs/Rusthon,rusthon/Rusthon,secureosv/pythia,pombredanne/Rusthon,secureosv/pythia,rusthon/Rusthon