fix #804

close #774

Bumps [@babel/parser](https://github.com/babel/babel) from 7.8.6 to 7.8.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.8.6...v7.8.7

)

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Bumps [@babel/types](https://github.com/babel/babel) from 7.8.6 to 7.8.7.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.8.6...v7.8.7

)

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fix #799

The next version of Typescript disallows 'this' parameter annotations on
accessors, which causes vue-next to fail to compile.

This PR removes the annotation and adds a cast instead.

Fixes #800

fix #795

Bumps [typescript](https://github.com/Microsoft/TypeScript) from 3.8.2 to 3.8.3.
- [Release notes](https://github.com/Microsoft/TypeScript/releases)
- [Commits](https://github.com/Microsoft/TypeScript/compare/v3.8.2...v3.8.3

)

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This avoids it being inlined multiple times in esm bundler builds

BREAKING CHANGE: adjust attr fallthrough behavior

    Updated per pending RFC https://github.com/vuejs/rfcs/pull/137

    - Implicit fallthrough now by default only applies for a whitelist
      of attributes (class, style, event listeners, a11y attributes, and
      data attributes).

    - Fallthrough is now applied regardless of whether the component has
      explicitly declared props. (close #749)

Bumps [rollup](https://github.com/rollup/rollup) from 1.31.1 to 1.32.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/compare/v1.31.1...v1.32.0

)

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fix #677, close #784

    This enables default support for parsing bigInt, optional chaining
    and nullish coalescing, and also adds the `expressionPlugins`
    compiler option for enabling additional parsing plugins listed at
    https://babeljs.io/docs/en/next/babel-parser#plugins.

fix #787

BREAKING CHANGE: revert setup() result reactive conversion

    Revert 6b10f0cd & a840e7dd. The motivation of the original change was
    avoiding unnecessary deep conversions, but that can be achieved by
    explicitly marking values non-reactive via `markNonReactive`.

    Removing the reactive conversion behavior leads to an usability
    issue in that plain objects containing refs (which is what most
    composition functions will return), when exposed as a nested
    property from `setup()`, will not unwrap the refs in templates. This
    goes against the "no .value in template" intuition and the only
    workaround requires users to manually wrap it again with `reactive()`.

    So in this commit we are reverting to the previous behavior where
    objects returned from `setup()` are implicitly wrapped with
    `reactive()` for deep ref unwrapping.

Bumps [@types/puppeteer](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/puppeteer) from 2.0.0 to 2.0.1.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/puppeteer

)

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