README: updates for v4.0.1 release

fixes #6425

Signed-off-by: Howard Pritchard <howardp@lanl.gov>

README

@@ -21,6 +21,8 @@ Copyright (c) 2017-2018 Los Alamos National Security, LLC.  All rights
                         reserved.
 Copyright (c) 2017      Research Organization for Information Science
                         and Technology (RIST). All rights reserved.
+Copyright (c) 2019      Triad National Security, LLC. All rights
+                        reserved.
 
 $COPYRIGHT$
 
@@ -64,7 +66,7 @@ Much, much more information is also available in the Open MPI FAQ:
 ===========================================================================
 
 The following abbreviated list of release notes applies to this code
-base as of this writing (March 2017):
+base as of this writing (February 2019):
 
 General notes
 -------------
@@ -508,8 +510,9 @@ MPI Functionality and Features
   - MPI_Handler_function (replaced by MPI_Comm_errhandler_function)
 
   Although these symbols are no longer prototyped in mpi.h, they
-  are still present in the MPI library in Open MPI v4.0.x. This
-  enables legacy MPI applications to link and run successfully with
+  are still present in the MPI library in Open MPI v4.0.1 and later
+  releases of the v4.0.x release stream. This enables legacy MPI
+  applications to link and run successfully with
   Open MPI v4.0.x, even though they will fail to compile.
 
   *** Future releases of Open MPI beyond the v4.0.x series may
@@ -608,7 +611,7 @@ MPI Functionality and Features
 OpenSHMEM Functionality and Features
 ------------------------------------
 
-- All OpenSHMEM-1.4 functionality is supported.
+- All OpenSHMEM-1.4 functionality is supported starting in release v4.0.1.
 
 
 MPI Collectives