Update README.md

README.md

@@ -1,5 +1,7 @@
 # FINUFFT.jl
 
+[![Build Status](https://travis-ci.org/ludvigak/FINUFFT.jl.svg?branch=master)](https://travis-ci.org/ludvigak/FINUFFT.jl)
+
 This is a Julia interface to [FINUFFT](https://github.com/flatironinstitute/finufft), a lightweight and fast nonuniform FFT (nufft) library released by the Flatiron Institute.
 
 ## Installation
@@ -47,4 +49,4 @@ See [test/runtests.jl](test/runtests.jl)
 
 ## TODO
 * Implement advanced interface
-* Test on Max OS X (specifically, fix osx building on Travis CI)
+* Test on Max OS X (specifically, fix osx building on Travis CI)