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Environments
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- Drop supporting Python-3.4
- Add supporting Python-3.7.
25: Python-3.7 introduce ``__dir__`` module function by :pep:`562`, so the
attribute must not override for another purpose. Thanks to Julien Enselme.
Incompatibility
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* 27: `settings` resource name will be renamed to `settings_` on Transifex.
Thanks to Anthony.
Features
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* 28,29: Add option `'-w', '--line-width'` for the maximum line width of PO files.
Thanks to Armand Ciejak.
Documentation
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- 22: _build/locale`` (for old sphinx) -> ``_build/gettext`` (for current sphinx)
Bug Fixes
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