update samples.

samples/Sample.RabbitMQ.SqlServer/Sample.RabbitMQ.SqlServer.csproj

@@ -10,6 +10,7 @@
     <PackageReference Include="Microsoft.AspNetCore.Mvc" Version="2.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.0" />
     <PackageReference Include="Microsoft.Extensions.Configuration.CommandLine" Version="2.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.0.0" />