Bump version to 'v2.3.0-preview.4

Author: andyleejordan

PowerShellEditorServices.Common.props

@@ -1,7 +1,7 @@
 <Project>
   <PropertyGroup>
     <VersionPrefix>2.3.0</VersionPrefix>
-    <VersionSuffix>preview.3</VersionSuffix>
+    <VersionSuffix>preview.4</VersionSuffix>
     <Company>Microsoft</Company>
     <Copyright>© Microsoft Corporation. All rights reserved.</Copyright>
     <PackageTags>PowerShell;editor;development;language;debugging</PackageTags>