chore(deps): update @angular to v7.2.15

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
@​angular/animations	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/common	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/compiler	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/core	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/forms	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/http	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/platform-browser	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/platform-browser-dynamic	dependencies	patch	7.2.13 -> 7.2.15	source
@​angular/router	dependencies	patch	7.2.13 -> 7.2.15	source

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Release Notes

angular/angular

### [`v7.2.15`](https://togithub.com/angular/angular/blob/master/CHANGELOG.md#​7215httpsgithubcomangularangularcompare72147215-2019-05-07) [Compare Source](https://togithub.com/angular/angular/compare/7.2.14...7.2.15) ##### Bug Fixes - **upgrade:** do not break if `onMicrotaskEmpty` emits while a `$digest` is in progress ([#​29794](https://togithub.com/angular/angular/issues/29794)) ([#​30107](https://togithub.com/angular/angular/issues/30107)) ([1084c19](https://togithub.com/angular/angular/commit/1084c19)), closes [#​24680](https://togithub.com/angular/angular/issues/24680) [/github.com/angular/angular/blob/78146c189/packages/core/src/util/ng_dev_mode.ts#L12](https://togithub.com//github.com/angular/angular/blob/78146c189/packages/core/src/util/ng_dev_mode.ts/issues/L12) [#​24680](https://togithub.com/angular/angular/issues/24680) ### [`v7.2.14`](https://togithub.com/angular/angular/blob/master/CHANGELOG.md#​7215httpsgithubcomangularangularcompare72147215-2019-05-07) [Compare Source](https://togithub.com/angular/angular/compare/7.2.13...7.2.14) ##### Bug Fixes - **upgrade:** do not break if `onMicrotaskEmpty` emits while a `$digest` is in progress ([#​29794](https://togithub.com/angular/angular/issues/29794)) ([#​30107](https://togithub.com/angular/angular/issues/30107)) ([1084c19](https://togithub.com/angular/angular/commit/1084c19)), closes [#​24680](https://togithub.com/angular/angular/issues/24680) [/github.com/angular/angular/blob/78146c189/packages/core/src/util/ng_dev_mode.ts#L12](https://togithub.com//github.com/angular/angular/blob/78146c189/packages/core/src/util/ng_dev_mode.ts/issues/L12) [#​24680](https://togithub.com/angular/angular/issues/24680)

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