Update version to the next pre-release patch version

Author: eXpl0it3r

Source/Directory.Build.props

@@ -5,9 +5,9 @@
     <Owners>Arthur Teplitzki</Owners>
     <Company>Open source hosted on GitHub</Company>
     <Copyright>Copyright © 2008-2026</Copyright>
-    <Version>1.6.0</Version>
-    <AssemblyVersion>1.6.0.0</AssemblyVersion>
-    <FileVersion>1.6.0.0</FileVersion>
+    <Version>1.6.1-dev</Version>
+    <AssemblyVersion>1.6.1.0</AssemblyVersion>
+    <FileVersion>1.6.1.0</FileVersion>
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <PackageLicenseExpression>BSD-3-Clause</PackageLicenseExpression>
     <PackageProjectUrl>https://codeplexarchive.org/project/HtmlRenderer</PackageProjectUrl>