dist: Update NEWS with 3.1.1 items

Signed-off-by: Brian Barrett <[email protected]>

Author: bwbarrett

NEWS

@@ -57,6 +57,23 @@ included in the vX.Y.Z section and be denoted as:
 3.1.1 -- June, 2018
 -------------------
 
+- Add new MCA parameter osc_sm_backing_store to allow users to specify
+  where in the filesystem the backing file for the shared memory
+  one-sided component should live.  Defaults to /dev/shm on Linux.
+- Fix potential hang on non-x86 platforms when using builds with
+  optimization flags turned off.
+- Disable osc/pt2pt when using MPI_THREAD_MULTIPLE due to numerous
+  race conditions in the component.
+- Fix dummy variable names for the mpi and mpi_f08 Fortran bindings to
+  match the MPI standard.  This may break applications which use
+  name-based parameters in Fortran which used our internal names
+  rather than those documented in the MPI standard.
+- Revamp Java detection to properly handle new Java versions which do
+  not provide a javah wrapper.
+- Fix RMA function signatures for use-mpi-f08 bindings to have the
+  asynchonous property on all buffers.
+- Improved configure logic for finding the UCX library.
+
 3.1.0 -- May, 2018
 ------------------