This is a minor bugfix release after the big changes of 0.14.0. The minor version has jumped straight to .3 due to two packaging errors on my side.

• F11 can now also be used by default to toggle fullscreen mode (many browsers and video players support this shortcut)
• Gosu.render now supports the retro: true argument in an option hash
• Linux: Improve both the default and fallback font logic; this should fix bold/italic text with the default font, and exceptions on some distributions
• Update all "stb" library dependencies
• Windows, Linux: MP3 files now work both in Songs and Samples