Apply UseNETCoreGenerator property when AzureFunctionsVersion is set to v2-prerelease (#254)

src/Microsoft.NET.Sdk.Functions.MSBuild/Targets/netstandard1.0/Microsoft.NET.Sdk.Functions.Build.targets

@@ -21,7 +21,7 @@ WARNING:  DO NOT MODIFY this file unless you are knowledgeable about MSBuild and
   <Target Name="_GenerateFunctionsPostBuild"
           AfterTargets="Build">
     <PropertyGroup>
-      <UseNETCoreGenerator Condition="$(UseNETCoreGenerator)=='' AND $(AzureFunctionsVersion) == 'v2'">true</UseNETCoreGenerator>
+      <UseNETCoreGenerator Condition="$(UseNETCoreGenerator)=='' AND ($(AzureFunctionsVersion) == 'v2' OR $(AzureFunctionsVersion) == 'v2-prerelease' )">true</UseNETCoreGenerator>
     </PropertyGroup>
     <!-- TODO: CopyFilesToOutputDirectory does not look at the outdir to copy the pdbs. hence copying it manually. -->
     <!-- Copy the application pdb to the bin folder-->