Change version from v0.2.3 to v0.3.0 per semver

> Minor version Y (x.Y.z | x > 0) MUST be incremented if new, backwards
> compatible functionality is introduced to the public API. It MUST be
> incremented if any public API functionality is marked as deprecated.
> It MAY be incremented if substantial new functionality or improvements
> are introduced within the private code. It MAY include patch level
> changes. Patch version MUST be reset to 0 when minor version is
> incremented.
Merge branch 'hotfix/fix-semver-v0.2.3' into stable