Minor Bug Fixes and a Readme Rewrite
code changes
- changed wttrin-default-accept-language variable name to just wttrin-default-languages
- fixed all remaining compiler warnings
- added proper License Boilerplate and SPDX-License-Identifier for GPL 3.0
readme changes
- format changed from markdown to org mode
- full rewrite: sections and badges and screenshots! oh my!
Full Changelog: v0.2.3...v0.2.4