py-babel: updated to 2.7.0

Version 2.7.0

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!

* General: Internal uses of babel.util.odict have been replaced with
  collections.OrderedDict from The Python standard library.

Improvements
~~~~~~~~~~~~
* CLDR: Upgrade to CLDR 35.1
* General: allow anchoring path patterns to the start of a string
* General: Bumped version requirement on pytz
* Messages: pybabel compile: exit with code 1 if errors were encountered
* Messages: Add omit-header to update_catalog
* Messages: Catalog update: keep user comments from destination by default
* Messages: Skip empty message when writing mo file
* Messages: Small fixes to avoid crashes on badly formatted .po files
* Numbers: parse_decimal() strict argument and suggestions
* Numbers: don't repeat suggestions in parse_decimal strict
* Numbers: implement currency formatting with long display names
* Numbers: parse_decimal(): assume spaces are equivalent to non-breaking spaces when not in strict mode
* Performance: Cache locale_identifiers()

Bugfixes
~~~~~~~~
* CLDR: Skip alt=... for week data (minDays, firstDay, weekendStart, weekendEnd)
* Dates: Fix wrong weeknumber for 31.12.2018
* Locale: Avoid KeyError trying to get data on WindowsXP
* Locale: get_display_name(): Don't attempt to concatenate variant information to None
* Messages: pofile: Add comparison operators to _NormalizedString
* Messages: pofile: don't crash when message.locations can't be sorted

Tooling & docs
~~~~~~~~~~~~~~
* Docs: Remove all references to deprecated easy_install
* Docs: Switch print statement in docs to print function - NotAFile
* Docs: Update all pypi.python.org URLs to pypi.org
* Docs: Use https URLs throughout project where available
* Support: Add testing and document support for Python 3.7
* Support: Test on Python 3.8-dev
* Support: Using ABCs from collections instead of collections.abc is deprecated.
* Tests: Fix conftest.py compatibility with pytest 4.3
* Tests: Update pytest and pytest-cov

(adam)