call 0.3.0

Calling dynamic link library(native function) in the way of defining static resources. You can use the package to open the dylib defined in the `assets` field of `pubsepc.yaml`.

[0.3.0] - Null Safety.

• Rewrite the doc on pub.dev

[0.2.3] - Repair the doc.

• Repair the url path of GitHub README.md file.

[0.2.2] - Repair the travis-ci file.

[0.2.1] - Repair the doc.

• Add travis-ci supported.

[0.2.0] - Change internal API.

• From interface to abstract class.
• Add [getDyLibModule] code docs to read API easily.

[0.1.0] - Change internal API.

• Support MacOS Release Mode.

[0.0.3] - Support Linux.

Linux test.

[0.0.2] - README.

Add docs content.

[0.0.1] - TODO: Add release date.

• TODO: Describe initial release.