update stable badges

Author: dehann

README.md

@@ -2,11 +2,19 @@
 
 Click on badges to follow links:
 
-Release v0.9 | Release v0.10 | Dev | Coverage | Documentation |
+Release v0.11 | Release v0.12 | Dev | Coverage | Documentation |
 ---------|---------|-----|------------|------------|
-[![Build Status](https://api.travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.9)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) | [![Build Status](https://api.travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.10)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) |  [![Build Status](https://api.travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=master)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) <br> [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/JuliaRobotics/DistributedFactorGraphs.jl.svg)](https://github.com/JuliaRobotics/DistributedFactorGraphs.jl/issues) | [![Codecov Status](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl) <br> [![Percentage of issues still open](https://isitmaintained.com/badge/open/JuliaRobotics/DistributedFactorGraphs.jl.svg)](https://github.com/JuliaRobotics/DistributedFactorGraphs.jl/issues) | [![docs](https://img.shields.io/badge/DFGDocs-latest-blue.svg)](http://juliarobotics.github.io/DistributedFactorGraphs.jl/latest/) <br> [![docs](https://img.shields.io/badge/CaesarDocs-latest-blue.svg)](http://juliarobotics.github.io/Caesar.jl/latest/)
+[![Build Status][dfg-build-v0.11]][dfg-build-url] | [![Build Status][dfg-build-v0.12]][dfg-build-url] | [![Build Status][dfg-build-img]][dfg-build-url] <br> [![Average time to resolve an issue](https://isitmaintained.com/badge/resolution/JuliaRobotics/DistributedFactorGraphs.jl.svg)](https://github.com/JuliaRobotics/DistributedFactorGraphs.jl/issues) | [![codecov.io][dfg-cov-img]][dfg-cov-url] <br> [![Percentage of issues still open](https://isitmaintained.com/badge/open/JuliaRobotics/DistributedFactorGraphs.jl.svg)](https://github.com/JuliaRobotics/DistributedFactorGraphs.jl/issues) | [![docs](https://img.shields.io/badge/DFGDocs-latest-blue.svg)](http://juliarobotics.github.io/DistributedFactorGraphs.jl/latest/) <br> [![docs](https://img.shields.io/badge/CaesarDocs-latest-blue.svg)](http://juliarobotics.github.io/Caesar.jl/latest/)
 
 
+[dfg-build-v0.11]: https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.11
+[dfg-build-v0.12]: https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.12
+
+[dfg-cov-img]: https://codecov.io/github/JuliaRobotics/DistributedFactorGraphs.jl/coverage.svg?branch=master
+[dfg-cov-url]: https://codecov.io/github/JuliaRobotics/DistributedFactorGraphs.jl?branch=master
+[dfg-build-img]: https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=master
+[dfg-build-url]: https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl
+
 DistributedFactorGraphs.jl provides a flexible factor graph API for use in the [Caesar.jl](https://github.com/JuliaRobotics/Caesar.jl) ecosystem. The package supplies:
 * A standardized API for interacting with factor graphs
 * Implementations of the API for in-memory and database-driven operation