Fix d.ts and upgrade build tools for dev

• chore: apply xo fix ecf6146
• Merge pull request #5 from 1natsu172/fix/test-and-build-for-publish d0ee0b9
• upgrade(build): upgrade rollup v1 latest and plugins a86e824
• fix(test): upgrade to ava v3 and babel7's and xo 3217bc1
• Merge pull request #4 from sectsect/fix-ts-error 8abb3b7
• Fix TypeScript error 96fc354
• 📝 chore: add some badges 3f45c4d

v2.1.0...v2.2.0