Fix typo and add link to the readme

[danielcgold]

Changes like this be perfect stuff for https://github.com/danielcgold/10-minute-tasks! ;)

[till]

Just fyi, you typo'd the link.

[edwardgeorge]

merged: 6619c3a
thanks!
(also, thanks to @till for pointing to the URL type, fixed in master.)

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