Update README.md

Author: ChrisRackauckas

README.md

@@ -4,8 +4,8 @@
 [![Build Status](https://travis-ci.org/JuliaDiffEq/Surrogates.jl.svg?branch=master)](https://travis-ci.org/JuliaDiffEq/Surrogates.jl)
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 A surrogate model is an approximation method that mimics the behavior of a computationally
 expensive simulation. In more mathematical terms: suppose we are attempting to optimize a function