chore(deps): update dependency prettier to v1.15.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
prettier	devDependencies	minor	1.14.3 -> 1.15.2	homepage, source

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Release Notes

prettier/prettier

### [`v1.15.2`](https://renovatebot.com/gh/prettier/prettier/blob/master/CHANGELOG.md#​1152) [Compare Source](https://renovatebot.com/gh/prettier/prettier/compare/1.15.1...1.15.2) [diff](https://renovatebot.com/gh/prettier/prettier/compare/1.15.1...1.15.2) - CLI: allow flag overriding ([#​5390](https://renovatebot.com/gh/prettier/prettier/pull/5390)) - JavaScript: do not apply test call formatting to arrow function without body ([#​5366](https://renovatebot.com/gh/prettier/prettier/pull/5366)) - JavaScript: do not duplicate comments in styled-components ([#​5416](https://renovatebot.com/gh/prettier/prettier/pull/5416)) - JavaScript: do not indent comments behind variable declarations ([#​5434](https://renovatebot.com/gh/prettier/prettier/pull/5434)) - JavaScript: inline property decorator should stay inline ([#​5364](https://renovatebot.com/gh/prettier/prettier/pull/5364), [#​5423](https://renovatebot.com/gh/prettier/prettier/pull/5423)) - JavaScript: treat `createSelector` as function composition ([#​5430](https://renovatebot.com/gh/prettier/prettier/pull/5430)) - Flow: do not move flow comment for function argument to its body ([#​5435](https://renovatebot.com/gh/prettier/prettier/pull/5435)) - Flow: force-break interface body to be consistent with TypeScript interface ([#​5432](https://renovatebot.com/gh/prettier/prettier/pull/5432)) - Flow/TypeScript: remove extra indentation for `extends` ([#​5432](https://renovatebot.com/gh/prettier/prettier/pull/5432)) - TypeScript: distinguish `module` and `namespace` correctly ([#​5432](https://renovatebot.com/gh/prettier/prettier/pull/5432)) - HTML: handle CRLF correctly ([#​5393](https://renovatebot.com/gh/prettier/prettier/pull/5393)) - HTML: handle `

` with interpolation ([#​5400](https://renovatebot.com/gh/prettier/prettier/pull/5400))
-   HTML: preserve content for `