Bump babel from 2.8.0 to 2.9.0

Bumps babel from 2.8.0 to 2.9.0.

Release notes

Sourced from babel's releases.

Version 2.8.1

This patch version only differs from 2.8.0 in that it backports in #752.

Changelog

Sourced from babel's changelog.

Version 2.9.0

Upcoming version support changes

* This version, Babel 2.9, is the last version of Babel to support Python 2.7, Python 3.4, and Python 3.5.

Improvements
~~~~~~~~~~~~

* CLDR: Use CLDR 37 – Aarni Koskela ([#734](https://github.com/python-babel/babel/issues/734))
* Dates: Handle ZoneInfo objects in get_timezone_location, get_timezone_name - Alessio Bogon ([#741](https://github.com/python-babel/babel/issues/741))
* Numbers: Add group_separator feature in number formatting - Abdullah Javed Nesar ([#726](https://github.com/python-babel/babel/issues/726))

Bugfixes
~~~~~~~~

* Dates: Correct default Format().timedelta format to 'long' to mute deprecation warnings – Aarni Koskela
* Import: Simplify iteration code in "import_cldr.py" – Felix Schwarz
* Import: Stop using deprecated ElementTree methods "getchildren()" and "getiterator()" – Felix Schwarz
* Messages: Fix unicode printing error on Python 2 without TTY. – Niklas Hambüchen
* Messages: Introduce invariant that _invalid_pofile() takes unicode line. – Niklas Hambüchen
* Tests: fix tests when using Python 3.9 – Felix Schwarz
* Tests: Remove deprecated 'sudo: false' from Travis configuration – Jon Dufresne
* Tests: Support Py.test 6.x – Aarni Koskela
* Utilities: LazyProxy: Handle AttributeError in specified func – Nikiforov Konstantin ([#724](https://github.com/python-babel/babel/issues/724))
* Utilities: Replace usage of parser.suite with ast.parse – Miro Hrončok

Documentation
~~~~~~~~~~~~~

* Update parse_number comments – Brad Martin ([#708](https://github.com/python-babel/babel/issues/708))
* Add __iter__ to Catalog documentation – @CyanNani123

Version 2.8.1
-------------

This is solely a patch release to make running tests on Py.test 6+ possible.

Bugfixes
~~~~~~~~

* Support Py.test 6 - Aarni Koskela ([#747](https://github.com/python-babel/babel/issues/747), [#750](https://github.com/python-babel/babel/issues/750), [#752](https://github.com/python-babel/babel/issues/752))

Commits

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