fix link in docs index.md

stable doesn't exist yet, remove link (for now)

same as 455f3ef but for the docs

docs/src/index.md

@@ -4,8 +4,7 @@
 [![Build Status](https://travis-ci.org/JuliaGeo/GeoJSON.jl.svg)](https://travis-ci.org/JuliaGeo/GeoJSON.jl)
 [![Build Status](https://ci.appveyor.com/api/projects/status/github/JuliaGeo/GeoJSON.jl?svg=true&branch=master)](https://ci.appveyor.com/project/JuliaGeo/GeoJSON-jl/branch/master)
 [![Coverage Status](https://coveralls.io/repos/JuliaGeo/GeoJSON.jl/badge.svg)](https://coveralls.io/r/JuliaGeo/GeoJSON.jl)
-[![Stable Documentation](https://img.shields.io/badge/docs-stable-blue.svg)](https://juliageo.github.io/GeoJSON.jl/stable)
-[![Latest Documentation](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliageo.github.io/GeoJSON.jl/dev)
+[![Latest Documentation](https://img.shields.io/badge/docs-dev-blue.svg)](https://juliageo.github.io/GeoJSON.jl/dev/)
 
 This library is developed independently of, but is heavily influenced in design by the [python-geojson](https://github.com/frewsxcv/python-geojson) package. It contains: