updating CHANGES, version and README files

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 LOG:
+Version 3.3.0 (development branch) versus 3.2.3
+-Front-End:
+1- Support .nc cache modifier and __ldg function to access the read-only L1D cache
+2- Partially-support some SASS_60 in the PTXP_PLUs (not completede yet)
+-GPU Core:
+1- Fermi/Pascal coalescer: coalescing on 32-bytes sectors.
+2- Adding separate dp, int and tenssor unit  pipeline.
+3- diff dual issue: allow scheduler to issue diff insts at a time
+4- Fair memory issue from multiple schedulers.
+-Cache System:
+1- Sector L1/L2 cache
+2- Fetch-on-write and lazy-fetch-on-read write allocation policy.
+3- Improving the L1 cache throughput (streaming L1 cache)
+4- Performance model for CUDA memory copy.
+5- Support memory partition indexing to reduce partition camping (POLY, XOR and PAE (ISCA’18)  Indexing)
+6- Adaptive cache configuration
+-Memory:
+1- Performance Model for HBM (mainly the dual-bus interface)
+2- Separate Read/Write buffers.
+3- Advanced bank indexing function.
+-Statistics:
+1- Adding more detailed cache statistics to define and analyze cache bottlenecks.
+2- Adding more detailed memory statistics (BLP, RBL, etc) to define and analyze memory bottlenecks.
+-Configs:
+Adding the Pascal and Volta config files that has been correlated against real hardware.
+See the correlation website here: 
+https://engineering.purdue.edu/tgrogers/group/correlator.html
+
+
 Version 3.2.3+edits (development branch) versus 3.2.3
 - Support for running regression tests using Travis
 - Support added for CUDA dynamic parallelism (courtesy of Jin Wang from Georgia Tech)