Add Estonian locale

[unbugged]

What kind of change does this PR introduce?

Adds Estonian locale according to #2

What is the current behavior?

Estonian locale is not currently available.

What is the new behavior?

Estonian locale is supported.

Checklist:

• Documentation
• Tests
• Ready to be merged

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[codecov]

Codecov Report

Merging #338 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #338   +/-   ##
========================================
  Coverage    87.78%   87.78%           
========================================
  Files           15       15           
  Lines          475      475           
  Branches        94       94           
========================================
  Hits           417      417           
  Misses          56       56           
  Partials         2        2           

Impacted Files	Coverage Δ
src/index.tsx	90.67% <0.00%> (ø)

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[arthurdenner]

Hi @unbugged!

Thank you for your interest in contributing to this library, really appreciate it!

I may have found a minor mistake with the ISO code, can you please check it?

[arthurdenner]

Nice, thank you again!

[arthurdenner]

🎉 This PR is included in version 2.9.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀