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Features
* Python 3.7 is now officially supported.
* Lines that start with the hash symbol () are no longer ignored when
composing posts in your editor. This allows to be used with Reddit's
markdown parser to denote headers.
* Added a new *dark colorblind* theme.
* Added support for the ``$RTV_PAGER`` environment variable, which can be
used to set a unique PAGER for rtv.
* Added the ability to sort submissions by **guilded**.
Bugfixes
* Fixed a crash when setting the ``$BROWSER`` with python 3.7.
* Improved the error message when attempting to vote on an archived post.
* Cleaned up several outdated MIME parsers. Removed the vidme, twitch,
oddshot, and imgtc parsers. Fixed the liveleak and reddit video parsers.
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