README: simplify paper URLs

The older ones now return 301 Moved Permanently

README.md

@@ -148,7 +148,7 @@ For further documentation, consult the [doc](doc) folder and [FitSpec API]
 documentation on Hackage.
 
 FitSpec has been subject to a paper, see the
-[FitSpec paper on Haskell Symposium 2016](https://matela.com.br/paper/fitspec.pdf).
+[FitSpec paper on Haskell Symposium 2016](https://matela.com.br/fitspec.pdf).
 FitSpec is also subject to a chapter in a [PhD Thesis (2017)].
 
 [Listable]:    https://hackage.haskell.org/package/leancheck/docs/Test-LeanCheck.html#t:Listable
@@ -163,7 +163,7 @@ FitSpec is also subject to a chapter in a [PhD Thesis (2017)].
 [TH]:      https://wiki.haskell.org/Template_Haskell
 [Cabal]:   https://www.haskell.org/cabal
 [Haskell]: https://www.haskell.org/
-[PhD Thesis (2017)]: https://matela.com.br/paper/rudy-phd-thesis-2017.pdf
+[PhD Thesis (2017)]: https://matela.com.br/thesis-rudy.pdf
 
 [fitspec-logo]: https://github.com/rudymatela/fitspec/raw/master/doc/fitspec.svg?sanitize=true