Fixed typo in README.md
Fixed typo in README.md
NASA-Tensegrity-Robotics-Toolkit/NTRTsim,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,NASA-Tensegrity-Robotics-Toolkit/NTRTsim