Cleanup Readme.

README.md

-OpenGeoSys 6                                                      {#mainpage}
+OpenGeoSys 6
 ============
 
 [![Tag](https://img.shields.io/github/tag/ufz/ogs.svg?style=flat-square)](https://github.com/ufz/ogs/releases)
@@ -19,15 +19,9 @@ waste deposition. OGS is comprised of the THMC-simulator (simply referred to as
 
 ## Current status ##
 
-It has to be noticed that the current ogs6 version is under very heavy development
-and [vivid discussion](https://github.com/ufz/ogs/issues), and not even reaching a
-beta release version, i.e. not all data structure and features are fixed yet. If
-you would like to have a peek into the current status of the code, we recommend to
-have a look at Norihiro's [draft branch](https://github.com/norihiro-w/ogs/tree/draft).
-Which is merely a proposed prototype. However, it should compile out of the box
-and supports many of the simulation processes in ogs5 already. The plan is to
-refactor the code and to merge in functionality into the official ogs6-repository
-feature-by-feature.
+It has to be noticed that the current OGS-6 version is under very heavy development
+and [vivid discussion](https://github.com/ufz/ogs/issues), and does not implement all
+functionality from OGS-5.
 
 ## Software development ##