Remove unused variable NETFrameworkPackageVersion (#387)

build/dependencies.props

@@ -2,7 +2,6 @@
   <PropertyGroup>
     <CoreFxVersion>4.4.0-*</CoreFxVersion>
     <InternalAspNetCoreSdkVersion>2.0.1-*</InternalAspNetCoreSdkVersion>
-    <NETFrameworkPackageVersion>2.0.0-*</NETFrameworkPackageVersion>
     <NETStandardImplicitPackageVersion>2.0.0-*</NETStandardImplicitPackageVersion>
     <RuntimeFrameworkVersion Condition="'$(TargetFramework)'=='netcoreapp2.0'">2.0.0-*</RuntimeFrameworkVersion>
     <SQLitePCLRawVersion>1.1.7</SQLitePCLRawVersion>