feat: add border radius prop to button

[adrianestevez1]

fix: #2491

Changes proposed in this PR:

-add borderRadius prop to Button component

• I have followed (at least) the PR section of the contributing guide.

@nexxtway/react-rainbow

[commit-lint]

Features

• add borderRadius prop to Button component (97607d3)
• add borderRadius prop to Button component (91056ab)

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[codeclimate]

Code Climate has analyzed commit 91056ab and detected 2 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Duplication	2

View more on Code Climate.

[github-actions]

Visit the preview URL for this PR (updated for commit 91056ab):

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