Update babel to 2.9.0

[pyup-bot]

This PR updates Babel from 2.7.0 to 2.9.0.

Changelog

2.9.0

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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)
* Dates: Handle ZoneInfo objects in get_timezone_location, get_timezone_name - Alessio Bogon (741)
* Numbers: Add group_separator feature in number formatting - Abdullah Javed Nesar (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)
* Utilities: Replace usage of parser.suite with ast.parse – Miro Hrončok

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

* Update parse_number comments – Brad Martin (708)
* Add __iter__ to Catalog documentation – CyanNani123

2.8.1

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

Bugfixes
~~~~~~~~

* Support Py.test 6 - Aarni Koskela (747, 750, 752)

2.8.0

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

* CLDR: Upgrade to CLDR 36.0 - Aarni Koskela (679)
* Messages: Don't even open files with the "ignore" extraction method - sebleblanc (678)

Bugfixes
~~~~~~~~

* Numbers: Fix formatting very small decimals when quantization is disabled - Lev Lybin, miluChen (662)
* Messages: Attempt to sort all messages – Mario Frasca (651, 606)

Docs
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* Add years to changelog - Romuald Brunet
* Note that installation requires pytz - Steve (Gadget) Barnes

Links

• PyPI: https://pypi.org/project/babel
• Changelog: https://pyup.io/changelogs/babel/
• Homepage: http://babel.pocoo.org/
• Docs: https://pythonhosted.org/Babel/

[pyup-bot]

Closing this in favor of #307