Update README.md

Author: ChrisRackauckas

README.md

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-# Quadrature
+# Quadrature.jl
+
+[![Build Status](https://travis-ci.org/JuliaDiffEq/Quadrature.jl.svg?branch=master)](https://travis-ci.org/JuliaDiffEq/Quadrature.jl)
 
 Quadrature.jl is an instantiation of the DiffEqBase.jl common `QuadratureProblem`
 interface for the common quadrature packages of Julia. By using Quadrature.jl,