Update README to include NonuniformFFTs.jl

Author: nHackel

README.md

@@ -12,7 +12,7 @@
 This package contains a collection of linear operators that are in particular useful for multi-dimensional signal and image processing tasks. All operators are build using the LinearOperators.jl base type and derive from `AbstractLinearOperator`. For example this package
 provides operators for the FFT (Fast Fourier Transform) and its non-equidistant variant (NFFT), the DCT (Discrete Cosine Transform), and the Wavelet transform. This package, however, does not implement
 these transformation itself but uses established libraries for them. So in fact, LinearOperatorCollection's main purpose is to add a wrapper around low-level libraries like
-FFTW.jl and NFFT.jl, which allows to use the transformation as if they would be linear operators, i.e. implement `Op * x`, `adjoint(Op) * x` and the `mul!` based in-place variants of the former.
+FFTW.jl, NFFT.jl and NonuniformFFTs.jl, which allows to use the transformation as if they would be linear operators, i.e. implement `Op * x`, `adjoint(Op) * x` and the `mul!` based in-place variants of the former.
 
 ## Installation