Put upper bound on pandas version requirement

BryanCutler · BryanCutler · commit 75252d5194ed · 2021-01-05T16:15:38.000-08:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,5 +1,5 @@
 numpy>=1.17
-pandas>=1.0.3
+pandas>=1.0.3,<1.2.0
 pyarrow>=1.0.0
 regex
 # TODO: The following dependency should go away when we switch to Python 3.8.
