chore(deps): update dependency rollup to ^0.67.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
rollup	devDependencies	minor	^0.66.0 -> ^0.67.0	source

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Release Notes

rollup/rollup

v0.67.0

Compare Source

2018-11-04

• add sourcemapExcludeSources option to exclude the source content from sourcemaps (#​2531)
• Create chunks for virtual modules when preserving modules (#​2511)
• Improve execution order of chunks and externals (#​2508)
• Do not resolve external dynamic imports via plugins (#​2505)
• Do not tree-shake children of unknown nodes to e.g. properly handle do-expressions via acorn plugin (#​2510)
• Fix mis-placed semicolons for certain SystemJS exports (#​2529)
• Prevent memory leak when using the bundle as cache (#​2522)
• Fix public sourcemap type (#​2507)

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[coveralls]

Coverage remained the same at 100.0% when pulling 4f552b4 on renovate/rollup-0.x into 9f697dd on master.