0.2.0

• upgrade modules
• rename internal variables main to datadom
• rename datadom.js, datadom.min.js to index.js and index.min.js
• further minimize generated js file with mangling and compression
• remove redundant code in build script
• use script directly instead of npx to speed up building
• add main and browser field in package.json.
• patch test code to make it work with upgraded modules
• release with compact directory structure