Update the InformationalVersion to 2.0.0-rc.1 (#1240)

Author: daxian-dbw

PSReadLine/PSReadLine.csproj

@@ -6,7 +6,7 @@
     <AssemblyName>Microsoft.PowerShell.PSReadLine2</AssemblyName>
     <AssemblyVersion>2.0.0.0</AssemblyVersion>
     <FileVersion>2.0.0</FileVersion>
-    <InformationalVersion>2.0.0-beta6</InformationalVersion>
+    <InformationalVersion>2.0.0-rc.1</InformationalVersion>
     <TargetFrameworks>net461;netcoreapp2.1</TargetFrameworks>
   </PropertyGroup>