Fix logo on PyPI (#763)
Fix logo on PyPI (#763)

Change the Cirq logo to an absolute URL so it isn't a broken link on PyPI.
quantumlib/Cirq,quantumlib/Cirq,quantumlib/Cirq,balopat/Cirq,balopat/Cirq,balopat/Cirq,quantumlib/Cirq,quantumlib/Cirq