Update babel to 2.6.0

[pyup-bot]

This PR updates Babel from 2.4.0 to 2.6.0.

Changelog

2.6.0

-------------

Possibly incompatible changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

These may be backward incompatible in some cases, as some more-or-less internal APIs have changed.
Please feel free to file issues if you bump into anything strange and we'll try to help!

* Numbers: Refactor decimal handling code and allow bypass of decimal quantization. (kdeldycke) (PR 538)
* Messages: allow processing files that are in locales unknown to Babel (akx) (PR 557)
* General: Drop support for EOL Python 2.6 and 3.3 (hugovk) (PR 546)

Other changes
~~~~~~~~~~~~~

* CLDR: Use CLDR 33 (akx) (PR 581)
* Lists: Add support for various list styles other than the default (akx) (552)
* Messages: Add new PoFileError exception (Bedrock02) (PR 532)
* Times: Simplify Linux distro specific explicit timezone setting search (scop) (PR 528)

Bugfixes
~~~~~~~~

* CLDR: avoid importing alt=narrow currency symbols (akx) (PR 558)
* CLDR: ignore non-Latin numbering systems (akx) (PR 579)
* Docs: Fix improper example for date formatting (PTrottier) (PR 574)
* Tooling: Fix some deprecation warnings (akx) (PR 580)

Tooling & docs
~~~~~~~~~~~~~~

* Add explicit signatures to some date autofunctions (xmo-odoo) (PR 554)
* Include license file in the generated wheel package (jdufresne) (PR 539)
* Python 3.6 invalid escape sequence deprecation fixes (scop) (PR 528)
* Test and document all supported Python versions (jdufresne) (PR 540)
* Update copyright header years and authors file (akx) (PR 559)

2.5.3

-------------

This is a maintenance release that reverts undesired API-breaking changes that slipped into 2.5.2
(see https://github.com/python-babel/babel/issues/550).

It is based on v2.5.1 (f29eccd) with commits 7cedb84, 29da2d2 and edfb518 cherry-picked on top.

2.5.2

-------------

Bugfixes
~~~~~~~~

* Revert the unnecessary PyInstaller fixes from 2.5.0 and 2.5.1 (533) (yagebu)

2.5.1

-------------

Minor Improvements and bugfixes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Use a fixed datetime to avoid test failures (520) (narendravardi)
* Parse multi-line __future__ imports better (519) (akx)
* Fix validate_currency docstring (522)
* Allow normalize_locale and exists to handle various unexpected inputs (523) (suhojm)
* Make PyInstaller support more robust (525, 526) (thijstriemstra, akx)

2.5.0

-------------

New Features
~~~~~~~~~~~~

* Numbers: Add currency utilities and helpers (491) (kdeldycke)
* Support PyInstaller (500, 505) (wodo)

Minor Improvements and bugfixes
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Dates: Add __str__ to DateTimePattern (515) (sfermigier)
* Dates: Fix an invalid string to bytes comparison when parsing TZ files on Py3 (498) (rowillia)
* Dates: Formatting zero-padded components of dates is faster (517) (akx)
* Documentation: Fix "Good Commits" link in CONTRIBUTING.md (511) (naryanacharya6)
* Documentation: Fix link to Python gettext module (512) (Linkid)
* Messages: Allow both dash and underscore separated locale identifiers in pofiles (489, 490) (akx)
* Messages: Extract Python messages in nested gettext calls (488) (sublee)
* Messages: Fix in-place editing of dir list while iterating (476, 492) (MarcDufresne)
* Messages: Stabilize sort order (482) (xavfernandez)
* Time zones: Honor the no-inherit marker for metazone names (405) (akx)

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 #153