version 1.7.91
* merge libzhuyin data

version 1.7.10
* fix issue 33 - fixes full/half width symbol input problem

version 1.7.9
* fix issue 31 - full width punctuation input with wrong symbol
* fix issue 32 - full/half width shortcut key switch with extra space output

version 1.7.8
* combine English/Punctuation modes into one mode.

version 1.7.7
* bug fixes.
* update translations.

version 1.7.4
* add option - "Use Space Key to Show Candidates".
* add option - "Show Candidates After the Cursor".
* use zhuyin_valid_zhuyin_keys method.

version 1.7.1
* migrate setup dialog to python 3.x.
* support gnome-software.

version 1.7.0
* the first release of 1.7.x series.