Fix URL in README.md

Julien LepillerThu Apr 18 13:46:05+0200 2019

eae1400

Fix URL in README.md

README.md

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### Report a bug, request improvements
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Well, you can use the [Issues](issues) button on the left :)
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Well, you can use the [Issues](https://framagit.org/nani-project/nani-website/issues) button on the left :)
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### Translate the website
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