Fix README.md URL (#282)

I there's some left-over formatting from when this was a .rst file

README.md

@@ -7,4 +7,4 @@ clusters with applications to radio astronomy in mind.  Includes modules for
 dynamically importing and utilizing mpi4py, in-memory mock-ups of h5py objects,
 and infrastructure for running data analysis pipelines on computer clusters.
 
-Documentation can be found at `<http://caput.readthedocs.org/>`_.
+Documentation can be found at http://caput.readthedocs.org/