update coverage badges

Author: ChrisRackauckas

README.md

@@ -2,8 +2,8 @@
 
 [![Build Status](https://travis-ci.com/JuliaDiffEq/RootedTrees.jl.svg?branch=master)](https://travis-ci.com/JuliaDiffEq/RootedTrees.jl)
 [![Build status](https://ci.appveyor.com/api/projects/status/o9w0cl0mokfpnj0d?svg=true)](https://ci.appveyor.com/project/ranocha/RootedTrees-jl)
-[![Coverage Status](https://coveralls.io/repos/github/ranocha/RootedTrees.jl/badge.svg?branch=master)](https://coveralls.io/github/ranocha/RootedTrees.jl?branch=master)
-[![codecov.io](http://codecov.io/github/ranocha/RootedTrees.jl/coverage.svg?branch=master)](http://codecov.io/github/ranocha/RootedTrees.jl?branch=master)
+[![Coverage Status](https://coveralls.io/repos/github/JuliaDiffEq/RootedTrees.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaDiffEq/RootedTrees.jl?branch=master)
+[![codecov](https://codecov.io/gh/JuliaDiffEq/RootedTrees.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaDiffEq/RootedTrees.jl)
 
 A collection of functionality around rooted trees to generate order conditions
 for Runge-Kutta methods in [Julia](https://julialang.org/).