compat: Update forward compatibility horizon to 2020-05-21

PiperOrigin-RevId: 312638952
Change-Id: I8d2533185f0976f307bc26dfe50b90e12ad300ad
diff --git a/tensorflow/python/compat/compat.py b/tensorflow/python/compat/compat.py
index 9bc9ca9..58b777a 100644
--- a/tensorflow/python/compat/compat.py
+++ b/tensorflow/python/compat/compat.py
@@ -33,7 +33,7 @@
 # This value changes every day with an automatic CL. It can be modified in code
 # via `forward_compatibility_horizon()` or with the environment variable
 # TF_FORWARD_COMPATIBILITY_DELTA_DAYS, which is added to the compatibility date.
-_FORWARD_COMPATIBILITY_HORIZON = datetime.date(2020, 5, 20)
+_FORWARD_COMPATIBILITY_HORIZON = datetime.date(2020, 5, 21)
 _FORWARD_COMPATIBILITY_DELTA_DAYS_VAR_NAME = "TF_FORWARD_COMPATIBILITY_DELTA_DAYS"
 _FORWARD_COMPATIBILITY_DATE_NUMBER = None