Fix #884 by avoiding using --pre with pip install in nightly Cirq compatibility checks
#897
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It turns out the pip
--preflag carries over to other packages that get installed as transitive dependencies. This can cause unexpected compatibility issues. We can avoid using--preby switching to usingcirq~=1.0.dev, which is more limited in its scope and gets us the latest dev version. Doing so ends up resolving issue #884.