Log Message:
translate-toolkit: updated to 3.0.0

Translate Toolkit 3.0.0

Formats and Converters
----------------------
- PO
    - Bring line wrapping closer to gettext

- XLIFF
    - Support non numeric ids on plurals in poxliff

- JSON
    - Added support for ARB files
    - Added support for go-i18n files

- Properties
    - Added support for GWT personality
    - Fix round trip of empty values without delimiter

- HTML
    - A makeover of the HTML parsing to fix several issues

- PHP
    - Add support for Laravel plurals
    - Improve round trip of some statements

- Windows RC
    - Rewritten parser using pyparsing

- l20n
    - Dropped support for deprecated format

General
-------
- Dropped support for Python 2.7.
- Python 3.5 or newer is now required.
- Minor docs improvements.
- Several cleanups in code.
- Removed deprecated interfaces:
    - multistring no longer accepts encoding
    - search.segment is removed
    - pofile.extractpoline is removed
    - simplify_to_common no longer accepts languages parameter
    - getsource/setsource/gettarget/settarget methods removed from storages
- Updated requirements, lxml is no longer optional.
- Added and updated tests.
- Optional deps can be specified using pip extras.