Release v0.3.0

• Functions that can fail now return Result.
• New Error type.

Release v0.2.0

• New core interfaces are more opinionated and a little easier to work with.
• Various improvements to usability.
• Added documentation; expanded README.

Release v0.1.2

Really fix docs.rs build.

This time for sure.

Release v0.1.1

Fix docs.rs build.

SDL2 uses network when using "bundled" feature, so disable that when
building on docs.rs.

Release v0.1.0

Initial release.