servant-machines-0.16: dependencies

Dependencies for servant-machines-0.16

library	base (>=4.9 && <5) bytestring (>=0.10.8.1 && <0.13) machines (>=0.6.4 && <0.8) mtl (>=2.2.2 && <2.3 \|\| >=2.3.1 && <2.4) servant (>=0.20 && <0.21)