Update dependency date-fns to v2.15.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
date-fns	devDependencies	minor	2.14.0 -> 2.15.0

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Release Notes

date-fns/date-fns

### [`v2.15.0`](https://togithub.com/date-fns/date-fns/blob/master/CHANGELOG.md#​2150---2020-07-17) [Compare Source](https://togithub.com/date-fns/date-fns/compare/v2.14.0...v2.15.0) Thanks to [@​belgamo](https://togithub.com/belgamo), [@​Matsuuu](https://togithub.com/Matsuuu), [@​Imballinst](https://togithub.com/Imballinst), [@​arsnyder16](https://togithub.com/arsnyder16), [@​pankajupadhyay29](https://togithub.com/pankajupadhyay29), [@​DCBN](https://togithub.com/DCBN), [@​leedriscoll](https://togithub.com/leedriscoll), [@​gottsohn](https://togithub.com/gottsohn), [@​mukuljainx](https://togithub.com/mukuljainx) and [@​dtriana](https://togithub.com/dtriana) for working on the release. Also kudos to [@​KidkArolis](https://togithub.com/KidkArolis), [@​imgx64](https://togithub.com/imgx64), [@​fjc0k](https://togithub.com/fjc0k), [@​wmonk](https://togithub.com/wmonk), [@​djD-REK](https://togithub.com/djD-REK), [@​dandv](https://togithub.com/dandv), [@​psimk](https://togithub.com/psimk) and [@​brimworks](https://togithub.com/brimworks) for improving the documentation. ##### Fixed - [Fixed behavior of `addBusinessDays` when input date is a weekend day](https://togithub.com/date-fns/date-fns/pull/1790). - [Fixed `parseISO` not returning `Invalid Date` on incorrect string when there are spaces in it](https://togithub.com/date-fns/date-fns/pull/1791). - [Fixed `es` round-tripping dates with Wednesday](https://togithub.com/date-fns/date-fns/pull/1792). - [Fixed round-trip bug with `d`/`EEEE` ordering in tokens like `PPPPP`](https://togithub.com/date-fns/date-fns/pull/1795). - [Fixed issues with parsing values in Japanese](https://togithub.com/date-fns/date-fns/pull/1807). - [Fixed Hungarian breaking IE11](https://togithub.com/date-fns/date-fns/pull/1842). - [Fixed Spanish accents in Saturday and Wednesday](https://togithub.com/date-fns/date-fns/pull/1872). ##### Changed - [Improved the message of protected tokens error](https://togithub.com/date-fns/date-fns/pull/1641). ##### Added - [Added Swiss-French `fr-CH` locale](https://togithub.com/date-fns/date-fns/pull/1810). - [Added Flemish `nl-BE` locale](https://togithub.com/date-fns/date-fns/pull/1812). - [Added Scottish Gaelic `gd` locale](https://togithub.com/date-fns/date-fns/pull/1832). - [Added New Zealand English `en-NZ` locale](https://togithub.com/date-fns/date-fns/pull/1835). - [Added `isMatch` function](https://togithub.com/date-fns/date-fns/pull/1868).

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