new link for 0.12 versioned docs, ref #439

README.md

@@ -37,7 +37,7 @@ Our documentation includes an installation guide, quick-start guide, and referen
 [juliaopt-notebooks]: https://github.com/JuliaOpt/juliaopt-notebooks
 
 **Latest Release**: 0.12.2 (via ``Pkg.add``)
-  * [Documentation](https://jump.readthedocs.org/en/latest)
+  * [Documentation](https://juliaopt.github.io/JuMP.jl/0.12/)
   * [Examples](https://github.com/JuliaOpt/JuMP.jl/tree/release-0.12/examples)
   * Testing status:
     * TravisCI: [![Build Status](https://travis-ci.org/JuliaOpt/JuMP.jl.svg?branch=release-0.12)](https://travis-ci.org/JuliaOpt/JuMP.jl)