Update Versions to 6.x (#178)

Updating to a minor version to check the updated CI pipeline

Author: deviousasti

RELEASE_NOTES.md

@@ -1,3 +1,7 @@
+### New in 6.0.1 - (Released 2024/9/22)
+
+* Updated build system
+  
 ### New in 6.0.0 - (Released 2024/4/3)
 
 * Release with relaxed support for System.Reactive 6.0 and above

src/Directory.Build.props

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" standalone="no"?>
 <Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <VersionPrefix>5.0.0</VersionPrefix>
+    <VersionPrefix>6.0.0</VersionPrefix>
     <Authors>Ryan Riley;Steffen Forkmann;Jared Hester</Authors>
     <Summary>A F#-friendly wrapper for the Reactive Extensions.</Summary>
     <Description>A F#-friendly wrapper for the Reactive Extensions.</Description>