Removed Hairer from NOTICE, as the full license is in LICENSE file.

The license is also present in the Gragg-Bulirsch-Stoer integrator
class.

NOTICE.txt

@@ -18,13 +18,6 @@ Benjamin McCann (http://www.benmccann.com) and distributed with
 the following copyright: Copyright 2009 Google Inc.
 ===============================================================================
 
-The GraggBulirschStoerIntegrator class in package
-org.apache.commons.math3.ode.nonstiff includes software translated
-from the odex Fortran routine developed by E. Hairer and G. Wanner.
-Original source copyright:
-Copyright (c) 2004, Ernst Hairer
-===============================================================================
-
 The EigenDecompositionImpl class in package
 org.apache.commons.math3.linear includes software translated
 from some LAPACK Fortran routines.  Original source copyright: