readme with note to new version of the library

Author: ederc

README

@@ -1,11 +1,4 @@
 F4RT - F4 Reduction Tools
 ========================================================================
-F4RT is a library of tools for implementing fast and efficient reduction
-in F4-like Groebner basis algorithms. Thus the tools focus on the special matrix
-structure appearing during Groebner basis algorithms. This structure leads to
-special Gaussian Elimination steps, e.g. as presented in "Parallel Gaussian
-Elimination for Gröbner bases computations in finite fields" by Faugère and
-Lachartre.
-Note that this library is dedicated to highly use CPU intrinsics and
-parallelization methods. Thus it cannot be guaranteed to be efficient on 
-or, even more, support older CPUs.
+The library is obsolete.
+The new version is available at https://github.com/ederc/pLA .