v0.2.0

Overview

• This version can output the metadata in the RO-Crate format.
• This version can also output the preview file for RO-Crate.

What's Changed

• Develop by @Surpris in #29
• Develop by @Surpris in #30
• Develop by @Surpris in #31
• fix a bug that the directory metadata does not have "hasPart" if it a… by @Surpris in #32
• Develop by @Surpris in #33
• update: readme by @Surpris in #34

Full Changelog: v0.1.3...v0.2.0