Update symreader branding to 3.0.0 (#372)

Author: ViktorHofer

eng/Versions.props

@@ -3,8 +3,7 @@
   <Import Project="Version.Details.props" />
 
   <PropertyGroup>
-    <!-- This repo version -->
-    <VersionPrefix>2.2.0</VersionPrefix>
+    <VersionPrefix>3.0.0</VersionPrefix>
     <PreReleaseVersionLabel>beta</PreReleaseVersionLabel>
     <!-- Opt-in/out repo features -->
     <UsingToolPdbConverter>false</UsingToolPdbConverter>