Update CONTRIBUTORS.md for clarity/consistency

CONTRIBUTORS.md

-Contributors to date (in chronological order, with current affiliations)
+Contributors to date (in chronological order, with affiliations at time of contribution)
+
 - Ning Liu, Rensselaer Polytechnic Institute
-- Jason Cope, Argonne National Labs
-- Philip Carns, Argonne National Labs
-- Misbah Mubarak, Argonne National Labs
-- Shane Snyder, Argonne National Labs
-- Jonathan P. Jenkins, Argonne National Labs
-- Noah Wolfe, RPI
-- Nikhil Jain, Lawrence Livermore National Labs
-- Giorgis Georgakoudis, Lawrence Livermore Labs
-- Matthieu Dorier, Argonne National Labs
-- Caitlin Ross, RPI
+- Jason Cope, Argonne National Laboratory
+- Philip Carns, Argonne National Laboratory
+- Misbah Mubarak, Argonne National Laboratory
+- Shane Snyder, Argonne National Laboratory
+- Jonathan P. Jenkins, Argonne National Laboratory
+- Noah Wolfe, Rensselaer Polytechnic Institute
+- Nikhil Jain, Lawrence Livermore National Laboratory
+- Jens Domke, Univ. of Dresden
+- Giorgis Georgakoudis, Lawrence Livermore National Laboratory
+- Matthieu Dorier, Argonne National Laboratory
+- Caitlin Ross, Rennselaer Polytechnic Institute
 - Xu Yang, Illinois Institute of Tech.
 - Jens Domke, Tokyo Institute of Tech.
-- Xin Wang, IIT
+- Xin Wang, Illinois Institute of Tech.
 - Neil McGlohon, Rensselaer Polytechnic Institute
 - Elsa Gonsiorowski, Rensselaer Polytechnic Institute
 - Justin M. Wozniak, Argonne National Laboratory
@@ -34,9 +36,10 @@ Misbah Mubarak (ANL)
     - Bug fixes for network, storage and workload models with CODES.
 
 Neil McGlohon (RPI)
-    - Introduced Megafly network model.
+    - Introduced Dragonfly Plus/Megafly network model.
     - Merged 1-D dragonfly and 2-D dragonfly network models.
     - Updated adaptive routing in megafly and 1-D dragonfly network models. 
+    - Extended slim fly network model's dual-rail mode to arbitrary number of rails (pending).
 
 Nikhil Jain, Abhinav Bhatele (LLNL)
     - Improvements in credit-based flow control of CODES dragonfly and torus network models.
@@ -57,6 +60,7 @@ John Jenkins
     - Enhanced the codes-mapping APIs to map advanced combinations on PEs.
     - Bug fixing with network models.
     - Bug fixing with MPI simulation layer.
+
 Xu Yang (IIT)
     - Added support for running multiple application workloads with CODES MPI
       Simulation layer, along with supporting scripts and utilities.
@@ -67,12 +71,10 @@ Noah Wolfe (RPI):
     - Added a fat tree network model that supports full and pruned fat tree
       network.
     - Added a multi-rail implementation for the fat tree networks (pending).
+    - Added a dual-rail implementation for slim fly networks (pending).
     - Bug reporter for CODES network models.
 
 Caitlin Ross (RPI):
     - Added instrumentation so that network models can report sampled
       statistics over virtual time (pending).
     - Bug reporter for CODES models.
-
-Neil McGlohon (RPI):
-    - Added dragonfly plus network model