Update rollup version

[gund]

Type of Issue

[ ] Bug Report
[x] Feature Request

Description

Current version of rollup being used has a major flaw in flat module bundles as it does not rename most of the reserved words (only undefined) in import statements (see rollup/rollup#2680).

That issue was addressed in rollup@1.2.0 via rollup/rollup#2689.

So my question is can ng-packagr update it's version of rollup so we can have proper FESM bundles?

How To Reproduce

See this example to understand the problem.

Expected Behaviour

FESM bundles should be properly flattened via newest version of rollup.

Version Information

$ node_modules/.bin/ng-packagr --version
ng-packagr:            4.7.1
@angular/compiler:     7.2.6
rollup:                0.67.4
tsickle:               0.34.3
typescript:            3.2.4
node: 11.9.0
npm: 6.5.0
rollup: 0.67.4 (from package-lock.json file)

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