Update rollup to the latest version 🚀

[greenkeeper]

The devDependency rollup was updated from 0.67.0 to 0.67.1.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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[greenkeeper]

• The devDependency rollup was updated from 0.67.0 to 0.67.2.

Update to this version instead 🚀

Commits

The new version differs by 3 commits.

• fe92d1f 0.67.2
• ed22964 Update changelog
• dbd2e47 Fix crash when returning undefined sourcemaps from renderChunk hook (#2558)

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[greenkeeper]

• The devDependency rollup was updated from 0.67.0 to 0.67.3.

Update to this version instead 🚀

Commits

The new version differs by 4 commits.

• d9a7d65 0.67.3
• 4be8888 Update changelog
• bbdf8b3 Add more files to npm distribution (#2552)
• 084354e fix: experimentalPreserveModules not supported in inlineDynamicImports message (#2560)

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[greenkeeper]

• The devDependency rollup was updated from 0.67.0 to 0.67.4.

Update to this version instead 🚀