Update README.md

Author: maxreiss123

README.md

@@ -38,6 +38,7 @@ The repository contains the implementation of the Gene Expression Programming[1]
 - [2] Reissmann, M., Fang, Y., Ooi, A., & Sandberg, R. (2024). Constraining genetic symbolic regression via semantic backpropagation. arXiv. https://arxiv.org/abs/2409.07369
  # Acknowledgement
  - The Coefficient optimization is inspired by [https://github.com/MilesCranmer/SymbolicRegression.jl](https://github.com/MilesCranmer/SymbolicRegression.jl/blob/master/src/ConstantOptimization.jl)
+ - We employ the insane fast [DynamicExpressions.jl](https://github.com/SymbolicML/DynamicExpressions.jl)
 
 # Todo 
 - [ ] Documentation