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Gentle reminder @MarkDaoust

@MichaelBroughton

I had to pin cirq==0.7 to make this work, otherwise (cirq==0.8) import tfq fails with

/usr/local/lib/python3.6/dist-packages/tensorflow_quantum/core/serialize/serializer.py in _eigen_gate_serializer(gate_type, serialized_id)
    112             serialized_name="exponent",
    113             serialized_type=float,
--> 114             gate_getter=lambda x: _symbol_extractor(x.exponent)),
    115         cirq.google.SerializingArg(
    116             serialized_name="exponent_scalar",

TypeError: __init__() got an unexpected keyword argument 'gate_getter'

This change looks correct to me, I'm not sure how it got broken, but I'm running it once to confirm that everything works.