bump cirq to v0.12.0.dev (quantumlib#4121)

I forgot to do this at the release of v0.11.
PhaseCraft · May 20, 2021 · fee500b · fee500b
1 parent e506614
commit fee500b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/cirq/_version.py b/cirq/_version.py
@@ -29,4 +29,4 @@
         'of cirq (e.g. "python -m pip install cirq==0.5.*")'
     )
 
-__version__ = "0.11.0.dev"
+__version__ = "0.12.0.dev"