Update README.md

Author: dlfivefifty

README.md

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 # ContinuumArrays.jl
 A package for representing quasi arrays with continuous dimensions
 
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 A quasi array as implemented in [QuasiArrays.jl](https://github.com/JuliaApproximation/QuasiArrays.jl) is a 
 generalization of an array that allows non-integer indexing via general axes. This package adds support for