Added pack step to build script

Author: ENikS

appveyor.yml

@@ -2,6 +2,13 @@ image: Visual Studio 2017
 configuration: Package
 platform: Any CPU
 
+dotnet_csproj:
+  patch: false
+  file: '**\*.csproj'
+  version: $(build_version)
+  package_version: $(build_version)
+#  file_version: $(APPVEYOR_BUILD_VERSION)
+  
 install:
 #  - ps: $env:build_version = (Get-Content -Raw -Path package.json | ConvertFrom-Json).version 
 #  - ps: Update-AppveyorBuild -Version "$env:build_version.$env:APPVEYOR_BUILD_NUMBER"
@@ -15,13 +22,9 @@ build:
   parallel: true
   verbosity: minimal
 
-dotnet_csproj:
-  patch: false
-  file: '**\*.csproj'
-  version: $(build_version)
-  package_version: $(build_version)
-#  file_version: $(APPVEYOR_BUILD_VERSION)
-  
+after_build:
+- cmd: NuGet pack
+
 before_test:
 - choco install opencover.portable
 - choco install codecov