Log Message:
py-ICU: update to 2.7.2. fixes build with icu 69.1.

Version 2.7.1 -> 2.7.2
----------------------
  - worked around limitation of Visual Studio 2017 (cgohlke)
  - added missing test and samples files to distribution (foutrelis)

Version 2.7 -> 2.7.1
--------------------
  - added some tests for TimeZone classes
  - fixed bug w/FormattedNumberRange.getFirst|SecondDecimal() gone w/ ICU 68.1+
  - fixed bug with VTimeZone.write() wrapper invoking VTimeZone.writeSimple()

Version 2.6 -> 2.7
------------------
  - added wrapper for Locale.canonicalize()
  - added wrappers for MeasureUnit.product(), reciprocal(), getDimensionality()
  - added wrapper for MeasureUnit.forIdentifier()
  - implemented *, /, **, 1/m for MeasureUnit in terms of product and reciprocal
  - added wrappers for BasicTimeZone, RuleBasedTimeZone, VTimeZone
  - added wrappers for TimeZoneTransition, TimeZoneRule and its subclasses
  - added wrappers for DateTimeRule, DateRuleType, TimeRuleType
  - added support for ICU 69.1