Add note about project being archived

README.md

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 See [projects related to the European Parliament](https://joelpurra.com/projects/european-parliament/) for background information, data, and results.
 
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+> ## ⚠️ This project has been archived
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+> No future updates are planned. Feel free to continue using it, but expect no support.
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 Uses data from [ep-erroneous-votes](https://github.com/joelpurra/ep-erroneous-votes), based on [open data dumps](http://parltrack.euwiki.org/dumps) from [Parltrack](http://parltrack.euwiki.org/). Uses [ep-the-corrections](https://github.com/joelpurra/ep-the-corrections)to visualize erroneous, and subsequently corrected, votes by [Members](http://www.europarl.europa.eu/meps/) of the [European Parliament](http://www.europarl.europa.eu/).
 
 Developed during the [Europarl Hackathon](http://europarl.me/), in preparation for the [European elections 2014](http://www.elections2014.eu/).