Update README.md

Author: dehann

README.md

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 # DistributedFactorGraphs.jl
 
-Release v0.8 | Dev | Coverage | DFG Docs | Caesar Docs |
----------|-----|----------|------|------------
-[![Build Status](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.8)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) |  [![Build Status](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=master)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) | [![Codecov Status](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl) | [![docs](https://img.shields.io/badge/docs-latest-blue.svg)](http://juliarobotics.github.io/DistributedFactorGraphs.jl/latest/) | [![docs](https://img.shields.io/badge/docs-latest-blue.svg)](http://juliarobotics.github.io/Caesar.jl/latest/)
+Release v0.8 | Release v0.9 | Dev | Coverage | DFG Docs | Caesar Docs |
+---------|---------|-----|----------|------|------------
+[![Build Status](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.8)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) | [![Build Status](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=release/v0.9)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) |  [![Build Status](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl.svg?branch=master)](https://travis-ci.org/JuliaRobotics/DistributedFactorGraphs.jl) | [![Codecov Status](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaRobotics/DistributedFactorGraphs.jl) | [![docs](https://img.shields.io/badge/docs-latest-blue.svg)](http://juliarobotics.github.io/DistributedFactorGraphs.jl/latest/) | [![docs](https://img.shields.io/badge/docs-latest-blue.svg)](http://juliarobotics.github.io/Caesar.jl/latest/)
 
 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