Update Directory.Build.props

Author: SimonCropp

src/Directory.Build.props

@@ -2,7 +2,7 @@
 <Project>
  <PropertyGroup>
  <NoWarn>CS1591;CS0649</NoWarn>
- <Version>6.8.3</Version>
+ <Version>6.9.0</Version>
  <AssemblyVersion>1.0.0</AssemblyVersion>
  <PackageTags>Testing, Snapshot, Diff, Compare</PackageTags>
  <Description>Launches diff tools based on file extensions. Designed to be consumed by snapshot testing libraries.</Description>