v0.2.1

Code refactoring and bug fix

- Changed: Remove unnecessary code and refactoring
- Fixed: Possible memory leak when stop_renderer is called

v0.2.0

Important performance improvement

- Changed: Separated GNUPlot command parsing and rendering from
Godot's draw calls
- Added: GNUPlot command parsing and rendering is now handled in a
separate thread
- Changed: Merged draw_line calls by draw_polyline method
- Added: Background transparency setting
- Added: Enable/disable antialiasing setting

v0.1.0

Initial release