Fix patch versions

Author: ryanbrandenburg

eng/Versions.props

@@ -4,7 +4,10 @@
     <MicrosoftDotNetBuildTasksFeedVersion>2.2.0-beta.18607.6</MicrosoftDotNetBuildTasksFeedVersion>
   </PropertyGroup>
   <PropertyGroup>
-    <VersionPrefix>3.0.0</VersionPrefix>
+    <MajorVersion>3</MajorVersion>
+    <MinorVersion>0</MinorVersion>
+    <PatchVersion>0</PatchVersion>
+    <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <PreReleaseVersionLabel>preview</PreReleaseVersionLabel>
     <PackageLicenseUrl>https://raw.githubusercontent.com/aspnet/AspNetCore/2.0.0/LICENSE.txt</PackageLicenseUrl>
     <Serviceable Condition="'$(Configuration)' == 'Release'">true</Serviceable>