update readme

README.rst

-    Overview
+Overview
 ========
 
 |VersionBadge| |BuildStatus| |CoverageReport| |DocsBuildStatus| |LicenseBadge| |PythonVersions|
@@ -34,6 +34,7 @@ PyOTRS is a Python wrapper for accessing `OTRS <https://www.otrs.com/>`_ (Versio
 REST API.
 
 .. warning::
+
     Please upgrade PyOTRS to atleast version 0.7.0 if you are using OTRS 6.0.27, 7.0.16 or
     newer! See `issue 27 <https://gitlab.com/rhab/PyOTRS/-/issues/27>`_ for more details.