added dependencies to nuspec and fixed build

Build/MQTTnet.nuspec

@@ -34,10 +34,14 @@
       <group targetFramework="netstandard1.3">
         <dependency id="NETStandard.Library" version="1.6.1" />
         <dependency id="System.Net.Security" version="4.3.2" />
+        <dependency id="Microsoft.Extensions.DependencyInjection" version="1.1.1" />
+        <dependency id="Microsoft.Extensions.Logging" version="1.1.2" />
       </group>
       
       <group targetFramework="uap10.0">
         <dependency id="Microsoft.NETCore.UniversalWindowsPlatform" version="5.4.0" />
+        <dependency id="Microsoft.Extensions.DependencyInjection" version="1.1.1" />
+        <dependency id="Microsoft.Extensions.Logging" version="1.1.2" />
       </group>
 
     </dependencies>

Build/build.ps1

@@ -11,7 +11,7 @@ if ($path) {
     &$msbuild ..\Frameworks\MQTTnet.Netstandard\MQTTnet.Netstandard.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="net451" /p:FileVersion=$version /p:AssemblyVersion=$version /verbosity:m
     &$msbuild ..\Frameworks\MQTTnet.Netstandard\MQTTnet.Netstandard.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard1.3" /p:FileVersion=$version /p:AssemblyVersion=$version /verbosity:m
     &$msbuild ..\Frameworks\MQTTnet.Netstandard\MQTTnet.Netstandard.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="uap10.0" /p:FileVersion=$version /p:AssemblyVersion=$version /verbosity:m
-    &dotnet build ..\Frameworks\MQTTnet.AspNetCore\MQTTnet.AspNetCore.csproj -c="Release" /p:FileVersion=$version /p:AssemblyVersion=$version
+    &$msbuild ..\Frameworks\MQTTnet.AspNetCore\MQTTnet.AspNetCore.csproj /t:Build /p:Configuration="Release" /p:TargetFramework="netstandard2.0" /p:FileVersion=$version /p:AssemblyVersion=$version /verbosity:m
 
     Remove-Item .\NuGet -Force -Recurse
     New-Item -ItemType Directory -Force -Path .\NuGet