update readme.md

[hcarrega]

This project was taken offline by its creator and maintainer Frank Denis on the 6th December 2018, after announcing in November 2017 that the project needs a new maintainer.

6 december 2018?

[jaromil]

ACK, yea, typo. Lets wait for some more comments in order to apply corrections in bulk.

[kmleow]

2 hyperlinks are incorrect in the markdown:

• [dnscrypt.org]() should not be hyperlink since the site is apparently down now
• [Dowse.eu]() should be [Dowse.eu](http://dowse.eu)