Update the badges in README.md for v1.0

Swap the v0.6 and v0.7 references for v1.0

README.md

@@ -1,8 +1,7 @@
 WAV.jl
 ======
 
-[![WAV](http://pkg.julialang.org/badges/WAV_0.6.svg)](http://pkg.julialang.org/?pkg=WAV&ver=0.6)
-[![WAV](http://pkg.julialang.org/badges/WAV_0.7.svg)](http://pkg.julialang.org/?pkg=WAV&ver=0.7)
+[![WAV](http://pkg.julialang.org/badges/WAV_1.0.svg)](http://pkg.julialang.org/?pkg=WAV&ver=1.0)
 [![Build Status](https://travis-ci.org/dancasimiro/WAV.jl.png)](https://travis-ci.org/dancasimiro/WAV.jl)
 [![Windows Build Status](https://ci.appveyor.com/api/projects/status/github/dancasimiro/wav.jl?branch=master&svg=true)](https://ci.appveyor.com/project/dancasimiro/wav-jl)
 [![Coverage Status](https://coveralls.io/repos/dancasimiro/WAV.jl/badge.png)](https://coveralls.io/r/dancasimiro/WAV.jl)