Update README.md

Author: OpenRealTimeSimulation

README.md

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 # ORTiS Solver C++ Code Generation Tools for Real-Time Simulation of Power Electronic Systems 
 
-Copyright (C) 2019-2020 Matthew Milton and Others
+Copyright (C) 2019-2021 Matthew Milton and Others
 
 Code generation tools for creation of CPU or FPGA real-time simulation C++ solvers of nonlinear electrical and power electronic systems.