Test pandas 1.0 release candidate

[rwedge]

See #843

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@d823454). Click here to learn what that means.
The diff coverage is 93.93%.

@@            Coverage Diff            @@
##             master     #844   +/-   ##
=========================================
  Coverage          ?   98.14%           
=========================================
  Files             ?      117           
  Lines             ?    10812           
  Branches          ?        0           
=========================================
  Hits              ?    10611           
  Misses            ?      201           
  Partials          ?        0

Impacted Files	Coverage Δ
featuretools/__main__.py	42.3% <0%> (ø)
featuretools/feature_base/features_serializer.py	100% <100%> (ø)
featuretools/feature_base/features_deserializer.py	100% <100%> (ø)
...utational_backend/test_calculate_feature_matrix.py	99.37% <100%> (ø)
featuretools/entityset/deserialize.py	100% <100%> (ø)
featuretools/utils/s3_utils.py	100% <100%> (ø)
featuretools/entityset/serialize.py	100% <100%> (ø)
...computational_backends/calculate_feature_matrix.py	98.58% <100%> (ø)

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[frances-h]

LGTM