Update README.md

README.md

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 - [PYWR](https://github.com/pywr/pywr): Spatial allocation tool 
 
 
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 ## Hydrology
 
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 - [iRONS](https://github.com/AndresPenuela/iRONS): iRONS (interactive Reservoir Operation Notebooks and Software) is a python package that enables the simulation, forecasting and optimisation of reservoir systems.
 
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 ## Meteorology
 
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 - [rainymotion](https://github.com/hydrogo/rainymotion): Python library for radar-based precipitation nowcasting based on optical flow techniques.
 
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 ## Seismology