Log Message:
Update to 3.0.0

Changelog:
3.0.0: 2019-09-06

GTK+ 3 support release. GTK+ 2 support is dropped.

Wide (16.9 ratio) slide support release. Note that this is a backward \ 
incompatible change.
Improvements
rabbit

    Added support for wide (16:9 ratio) slide.

    To use wide slide, you just specify wide size by --size option such as \ 
--size 800,450.

    This is a backward incompatible change. If you already use wide size, text \ 
size in your slide is changed.

    You can use the same text size in normal (4:3 ratio) slide and wide (16:9 \ 
ratio) slide since this release. Text size is different before this release.
    Changed to use GTK+ 3 by default.
    Dropped support for GTK+ 2.

    Added support for "as large as possible text" without wrapping.

    This is a change that may change slide rendering result.
    Stopped to reset timer on reload.

    Added support for start-time and end-time title slide attributes.

    If both start-time and end-time are specified, you don't need to specify \ 
allotted-time. allotted-time can be computed from them.

    Here is an example that show how to specify 1 hour talk:

    = Title

    : start-time
       2017-10-08T11:00:00+09:00
    : end-time
       2017-10-08T12:00:00+09:00

    Dropped support for getting slide source from Hiki.
    Dropped support for getting slide source from SlideShare.

    RD: Removed <URL:...> mark from the default text of URL link.

    This is a change that may change slide rendering result.
    Added support for animation GIF.

    Stopped to force keeping above. --no-keep-above option is also removed.

    [Suggested by Shugo Maeda]
    info-window: Added support for reloading theme. [GitHub#118][Reported by \ 
Dominique Martinet]
    Added support for kramdown 2.1.0 or later. [GitHub#120][Reported by Yusuke \ 
Nakamura]
    Added workaround for environment that sends arrow key with mod2 mask. \ 
[GitHub#121][Reported by Yukihiro Matsumoto]
    Added support for align tags in table cell.
    Suppressed a Proc.new warning. [GitHub#124][Patch by Nobuyoshi Nakada]
    Added support for link in note.

    Improved text rendering on scale. Text wrapping isn't changed by scaling.

    [Reported by Yukihiro Matsumoto]

rabbit-slide

    Added --licenses option. [GitHub#116][Patch by Yusuke Nakamura]
    Added support for GUI.

Theme

    clear-blue: Decreases the default graffiti line width.
    lightning-talk-toolkit: Added support for customizing @lightning_talk_wrap_mode.
    image-viewer: Added support for image timer.
    Added font_size method for computing font size in theme.

Document

    Changed to use HTTPS. [GitHub#122][Patch by Kazuhiro NISHIYAMA]

Fixes
rabbit

    Fixed a bug that printing is failed when slide title has special character \ 
for file name. [GitHub#117][Reported by Dominique Martinet]

Document

    Fixed a typo. [GitHub#113][Patch by Hiroshi Hatake]
    Fixed broken links. [GitHub#114][Patch by Yusuke Nakamura]

Thanks

    Hiroshi Hatake
    Shugo Maeda
    Yusuke Nakamura
    Dominique Martinet
    Yukihiro Matsumoto
    Kazuhiro NISHIYAMA
    Nobuyoshi Nakada