Compatibility

A quick disclaimer on backwards-compatibility for Toyplot users:

Toyplot follows the Semantic Versioning standard for assigning version numbers in a way that has specific meaning. Toyplot version numbers use <major>.<minor>.<patch> numbering. Releases with different major API numbers are API incompatible. Minor version numbers signify new features that are backwards-compatible with the current major version. Patch numbers indicate bug fixes and documentation changes that are backwards-compatible with the current major and minor version.