Update dependency rollup-plugin-commonjs to v9.3.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
rollup-plugin-commonjs	9.2.1 -> 9.3.4

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Release Notes

rollup/rollup-plugin-commonjs

v9.3.4

Compare Source

2019-04-04

• Make "extensions" optional (#​384)
• Use same typing for include and exclude properties (#​385)

v9.3.3

Compare Source

2019-04-04

• Remove colon from module prefixes (#​371)

v9.3.2

Compare Source

2019-04-04

• Use shared extractAssignedNames, fix destructuring issue (#​303)

v9.3.1

Compare Source

2019-04-04

• Include typings in release (#​382)

v9.3.0

Compare Source

2019-04-03

• Add TypeScript types (#​363)

v9.2.3

Compare Source

2019-04-02

• Improve support for ES3 browsers (#​364)
• Add note about monorepo usage to readme (#​372)
• Add .js extension to generated helper file (#​373)

v9.2.2

Compare Source

2019-03-25

• Handle array destructuring assignment (#​379)

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