Delete links to old PkgEval badges

Author: andreasnoack

README.md

@@ -1,7 +1,5 @@
 # Combinatorics
 
-[![Combinatorics](http://pkg.julialang.org/badges/Combinatorics_0.6.svg)](http://pkg.julialang.org/?pkg=Combinatorics)
-[![Combinatorics](http://pkg.julialang.org/badges/Combinatorics_0.7.svg)](http://pkg.julialang.org/?pkg=Combinatorics)
 [![Build Status](https://travis-ci.org/JuliaMath/Combinatorics.jl.svg?branch=master)](https://travis-ci.org/JuliaMath/Combinatorics.jl)
 [![Coverage Status](https://coveralls.io/repos/github/JuliaMath/Combinatorics.jl/badge.svg?branch=master)](https://coveralls.io/github/JuliaMath/Combinatorics.jl?branch=master)
 [![Codecov](https://codecov.io/gh/JuliaMath/Combinatorics.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaMath/Combinatorics.jl)