update badge with JuliaGraphs organization

Author: matbesancon

README.md

@@ -1,7 +1,8 @@
 # LightGraphsMatching
 
-[![Build Status](https://travis-ci.org/mbesancon/LightGraphsMatching.jl.svg?branch=master)](https://travis-ci.org/mbesancon/LightGraphsMatching.jl)
+[![Build Status](https://travis-ci.org/JuliaGraphs/LightGraphsMatching.jl.svg?branch=master)](https://travis-ci.org/JuliaGraphs/LightGraphsMatching.jl)
 
-[![Coverage Status](https://coveralls.io/repos/github/mbesancon/LightGraphsMatching.jl/badge.svg?branch=master)](https://coveralls.io/github/mbesancon/LightGraphsMatching.jl?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/JuliaGraphs/LightGraphsMatching.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaGraphs/LightGraphsMatching.jl?branch=master)
+
+[![codecov](https://codecov.io/gh/JuliaGraphs/LightGraphsMatching.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaGraphs/LightGraphsMatching.jl)
 
-[![codecov.io](http://codecov.io/github/mbesancon/LightGraphsMatching.jl/coverage.svg?branch=master)](http://codecov.io/github/mbesancon/LightGraphsMatching.jl?branch=master)