NEWS: Add bullet about Fortran ABI changes

Per the bullet added to NEWS, these ABI changes were made to correct
erroneous Fortran bindings.  It is exceedingly unlikely that anyone
was using them, because they would have complained that the
names/types were outright wrong.  Hence, it's safe to make these
changes, even though they're not backwards compatible with v2.0.0 and
v2.0.1.

Signed-off-by: Jeff Squyres <[email protected]>

Author: jsquyres

NEWS

@@ -53,6 +53,21 @@ included in the vX.Y.Z section and be denoted as:
    (** also appeared: A.B.C)  -- indicating that this item was previously
                                  included in release version vA.B.C.
 
+2.0.2 -- TBD
+-----------------------
+
+- The following backwards-incompatible changes to the Fortran API were
+  made.  They were made because Open MPI's Fortran bindings for these
+  were incorrect; any MPI applications using them were therefore also
+  erroneous, and not subject to backwards compatibility constraints.
+  - All Fortran bindings:
+    - The type of MPI_DISPLACEMENT_CURRENT was changed from INTEGER to
+      INTEGER(KIND=MPI_OFFSET_KIND)
+  - Fortran "use mpi" module:
+    - MPI_File_wr_at_all_begin -> MPI_File_write_at_all_begin
+    - MPI_File_read_ord_begin -> MPI_File_read_ordered_begin
+
+
 2.0.1 -- 2 September 2016
 -----------------------