Update README.md

Author: Milan K

README.md

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 A shallow water model with a focus on type-flexibility and 16bit number formats. ShallowWaters allows for Float64/32/16, [BigFloat](https://docs.julialang.org/en/v1/base/numbers/#BigFloats-and-BigInts-1)/[ArbFloat](https://github.com/JeffreySarnoff/ArbNumerics.jl)/[DoubleFloats](https://github.com/JuliaMath/DoubleFloats.jl), [Posit32/16/8](https://github.com/milankl/SoftPosit.jl), [BFloat16](https://github.com/JuliaComputing/BFloat16s.jl), [Sonum16](https://github.com/milankl/Sonums.jl) and in general every number format with arithmetics and conversions implemented. ShallowWaters also allows for mixed-precision and reduced precision communication.
 
-ShallowWaters is fully-explicit with an energy and enstrophy conserving advection scheme and a Smagorinsky-like biharmonic diffusion operator. Tracer advection is implemented with a semi-Lagrangian advection scheme. Runge-Kutta 4th-order is used for pressure, advective and Coriolis terms and the continuity equation. Semi-implicit time stepping for diffusion and bottom friction. Boundary conditions are either periodic (only in x direction) or non-periodic super-slip, free-slip, partial-slip, or no-slip. Output via NetCDF.
+ShallowWaters is fully-explicit with an energy and enstrophy conserving advection scheme and a Smagorinsky-like biharmonic diffusion operator. Tracer advection is implemented with a semi-Lagrangian advection scheme. Runge-Kutta 4th-order is used for pressure, advective and Coriolis terms and the continuity equation. Semi-implicit time stepping for diffusion and bottom friction. Boundary conditions are either periodic (only in x direction) or non-periodic super-slip, free-slip, partial-slip, or no-slip. Output via [NetCDF](https://github.com/JuliaGeo/NetCDF.jl).
 
 Please feel free to raise an [issue](https://github.com/milankl/ShallowWaters.jl/issues) if you discover bugs or have an idea how to improve ShallowWaters.