Pin Pandas to 0.22.0 so that Ulmo can work
Pin Pandas to 0.22.0 so that Ulmo can work

Ulmo does not specify dependency versions, making it vulnerable
to API changes. One such API was pandas.Timestamp().to_datetime,
marked as deprecated since 0.21.0 and finally removed in 0.23.0,
in favor of pandas.Timestamp().to_pydatetime.

Until this fix is in Ulmo, we're relegated to using an older
version of pandas to prevent runtime crashes when querying
CUAHSI data.

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