dist: Add Collectives backports to NEWS

Signed-off-by: Brian Barrett <bbarrett@amazon.com>

Author: bwbarrett

NEWS

@@ -63,6 +63,7 @@ included in the vX.Y.Z section and be denoted as:
 - OFI/libfabric: Added support for multiple NICs
 - OFI/libfabric: Added support for Scalable Endpoints
 - OFI/libfabric: Added btl for one-sided support
+- libnbc: Adding numerous performance-improving algorithms
 
 4.0.4 -- June, 2020
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