Update README

Author: wxmerkt

README.md

@@ -1,14 +1,10 @@
-octomap_mapping
+octomap_mapping [![Build Status](https://travis-ci.org/OctoMap/octomap_mapping.svg?branch=kinetic-devel)](https://travis-ci.org/OctoMap/octomap_mapping)
 ===============
 
-ROS stack for mapping with OctoMap, contains the octomap_server package.
+ROS stack for mapping with OctoMap, contains the `octomap_server` package.
 
-The `master` branch tracks the latest (stable) releases. Please send pull requests against the latest development branch, e.g. `indigo-devel`.
+The main branch for Kinetic, Melodic, and Noetic is `kinetic-devel`.
 
 Indigo: [![Build Status](https://travis-ci.org/OctoMap/octomap_mapping.svg?branch=indigo-devel)](https://travis-ci.org/OctoMap/octomap_mapping)
 
-Kinetic/Melodic: [![Build Status](https://travis-ci.org/OctoMap/octomap_mapping.svg?branch=kinetic-devel)](https://travis-ci.org/OctoMap/octomap_mapping)
-
-<!--- Melodic: [![Build Status](https://travis-ci.org/OctoMap/octomap_mapping.svg?branch=melodic-devel)](https://travis-ci.org/OctoMap/octomap_mapping)-->
-
 Imported from SVN, see https://code.google.com/p/alufr-ros-pkg/ for the previous versions.