Update README.md

Author: ChrisRackauckas

README.md

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 # PoissonRandom
 
 [![Build Status](https://travis-ci.org/JuliaDiffEq/PoissonRandom.jl.svg?branch=master)](https://travis-ci.org/JuliaDiffEq/PoissonRandom.jl)
-[![Coverage Status](https://coveralls.io/repos/ChrisRackauckas/PoissonRandom.jl/badge.svg?branch=master&service=github)](https://coveralls.io/github/ChrisRackauckas/PoissonRandom.jl?branch=master)
-[![codecov.io](http://codecov.io/github/ChrisRackauckas/PoissonRandom.jl/coverage.svg?branch=master)](http://codecov.io/github/ChrisRackauckas/PoissonRandom.jl?branch=master)
 
 ## Usage