chore(deps): update dependency rollup to v0.60.7

[renovate]

This Pull Request updates dependency rollup from v0.60.1 to v0.60.7

Release Notes

v0.60.7

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2018-06-14

• Fix typing issue (#​2269)

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v0.60.6

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2018-06-14

• Track mutations of included virtual arrays (#​2263)
• Update readme (#​2266)

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v0.60.5

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2018-06-14

• Track deep reassignments of global and exported variables and improve performance (#​2254)

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v0.60.4

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2018-06-13

• Properly handle initially uninitialized exports and exports of globals in SystemJS output (#​2258)

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v0.60.3

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2018-06-13

• Fix types to allow watching an array of outputs (#​2262)

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v0.60.2

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2018-06-11

• Permit setting an asset's source in generateBundle (#​2256)
• Add automatic linting (#​2242)

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This PR has been generated by Renovate Bot.