Update date-fns requirement from ~1.30.0 to ~2.0.1

[dependabot-preview]

Updates the requirements on date-fns to permit the latest version.

Release notes

Sourced from date-fns's releases.

v2.0.1

See the changelog: https://github.com/date-fns/date-fns/blob/master/CHANGELOG.md#201---2019-08-23

Changelog

Sourced from date-fns's changelog.

[2.0.1] - 2019-08-23

Fixed

• Fix getWeekOfMonth with options.weekStartsOn set to 1 not working for Sundays. Kudos to @​waseemahmad31!

[2.0.0] - 2019-08-20

If you're upgrading from v2 alpha or beta, see the pre-release changelog.

Fixed

• Fix the toDate bug occurring when parsing ISO-8601 style dates (but not valid ISO format)
  with a trailing Z (e.g 2012-01Z), it returned Invalid Date for FireFox/IE11 #510

• Fix differenceIn... functions returning negative zero in some cases:
  #692

• isDate now works properly with dates passed across iframes #754.

• Fix a few bugs that appear in timezones with offsets that include seconds (e.g. GMT+00:57:44).
  See PR #789.

• Fixed DST issue. See #972 and #992 for more details.

• Fixed DST issue in eachDayOfInterval that caused time in the days
  after DST change to have the shift as well.

• Fix bug in Galician locale caused by incorrect usage of getHours
  instead of getUTCHours.

Changed

• BREAKING: now functions don't accept string arguments, but only
  numbers or dates. When a string is passed, it will result in
  an unexpected result (Invalid Date, NaN, etc).

  From now on a string should be parsed using parseISO (ISO 8601)
  or parse.

  In v1 we've used new Date() to parse strings, but it resulted in many
  hard-to-track bugs caused by inconsistencies in different browsers.
  To address that we've implemented our ISO 8601 parser but that made
  library to significantly grow in size. To prevent inevitable bugs
  and keep the library tiny, we made this trade-off.

  See this post for more details.

  // Before v2.0.0

... (truncated)

Commits

• c1182c0 Update README
• d876309 Add changelog entry for 2.0.1
• 6244923 fixed issue: options.weekStartsOn set to 1 doesn't work for Sundays (#1046)
• 85ba4d8 Fix typo in lightFormat docs [skip ci]
• 55deaf6 Update the changelog
• 055fa3a Update README
• 146e3c4 Upgrade the changelog
• 4b990a1 Remove some obsolete leftover changes
• 7baad3c Run TS build test to the smoke tests
• 8cc8e35 Use export default instead of export = in TS
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #161.