chore(deps): update dependency rollup-plugin-typescript2 to ^0.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
rollup-plugin-typescript2	devDependencies	minor	^0.20.1 -> ^0.21.0	source

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Release Notes

ezolenko/rollup-plugin-typescript2

### [`v0.21.0`](https://togithub.com/ezolenko/rollup-plugin-typescript2/compare/0.20.1...0.21.0) [Compare Source](https://togithub.com/ezolenko/rollup-plugin-typescript2/compare/0.20.1...0.21.0)

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