README: Add link to LICENSE

[wbnns]

Hi there! Since this is a trivial change, I've titled this without an issue number. This adds a hyperlink to the LICENSE in README.rst, so users don't have to scroll around and can easily navigate to it.

Automerge-Triggered-By: @csabella

[the-knights-who-say-ni]

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[eamanu]

Good change. LGTM

[wbnns]

@nanjekyejoannah @eamanu Thanks for reviewing!

[nanjekyejoannah]

I wonder why one of the tests never runs

[csabella]

Closing and reopening to retrigger tests.

[wbnns]

@csabella Thanks! :)

[nanjekyejoannah]

Thanks @wbnns for your contribution.