Drop dup link

Author: Blaisorblade

docs/blog/_posts/2018-03-05-seventh-dotty-milestone-release.md

@@ -152,6 +152,5 @@ to make sure that our regression suite includes your library.
 [@biboudis]: https://github.com/biboudis
 [@allanrenucci]: https://github.com/allanrenucci
 [@Blaisorblade]: https://github.com/Blaisorblade
-[@Blaisorblade]: https://github.com/Blaisorblade
 [@Duhemm]: https://github.com/duhemm