Link to caniusepython3.com for unported projects

[GoogleCodeExporter]

caniusepython3.com now has stable URLs, so it would be great to show the badge 
with the count of unported dependencies be shown along with a link to the 
caniusepython3.com page, e.g. https://caniusepython3.com/project/PasteScript

Original issue reported on code.google.com by bcannon on 15 May 2014 at 1:37

[ubershmekel]

Showing the amount of blockers sounds interesting. Though nowadays there are so few packages not on python 3 that this may be it doesn't matter? We're at 171/200 right now.

@brettcannon a pull request would be welcome if you are interested.

[brettcannon]

@jezdez might be interested as the creator of caniusepython3.com

[flying-sheep]

Prominent links to http://py3readiness.org/ and https://caniusepython3.com/ would be great as a last goodbye from this super nice project.