build: update rollup to version 2.31.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rollup (source)	dependencies	minor	2.30.0 -> 2.31.0
rollup (source)	devDependencies	minor	2.30.0 -> 2.31.0

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Release Notes

rollup/rollup

v2.31.0

Compare Source

2020-10-15

Features

• When using the output.moduleToStringTag option, also add the tag to entries with exports and simulated external namespaces (#​3822)
• Add the __esModule interop marker to IIFE global variables unless output.esModule is turned off (#​3822)

Pull Requests

• #​3822: Add module toStringTag to entries and interop namespaces (@​lukastaegert)

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