docs: Happy New Year! 🎁

[dsseng]

Description

2019! 🎄 🎁
Update year.

P.S. This is a copy of the #6002 for dev branch

Motivation and Context

Happy New Year! Merry Christmas! gift
It has been a pleasure to work with you this year. I wish you the best of holidays and a Happy New Year! 🎅 🎄

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Improvement/refactoring (non-breaking change that doesn't add any feature but make things better)

Checklist:

• The PR title is no longer than 64 characters.
• The PR is submitted to the correct branch (master for bug fixes and documentation updates, dev for new features and breaking changes).
• My code follows the code style of this project.
• I've added relevant changes to the documentation (applies to new features and breaking changes in core library)

[vercel]

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[codecov]

Codecov Report

Merging #6003 into dev will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev    #6003      +/-   ##
==========================================
+ Coverage   88.49%   88.54%   +0.04%     
==========================================
  Files         282      282              
  Lines        6313     6313              
  Branches     1586     1586              
==========================================
+ Hits         5587     5590       +3     
+ Misses        608      605       -3     
  Partials      118      118

Impacted Files	Coverage Δ
...fy/src/components/transitions/expand-transition.js	72% <0%> (+12%)	⬆️

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[MajesticPotatoe]

master should suffice.

[lock]

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