Fixing versioning syntax

Author: Damon Prater

appveyor.yml

@@ -21,9 +21,9 @@ platform: Any CPU
 before_build:
 - cmd: dotnet restore
 build_script:
-- cmd: dotnet publish -f netcoreapp1.1 -c Release /property:Version=$env:APPVEYOR_BUILD_VERSION
+- cmd: dotnet publish -f netcoreapp1.1 -c Release /property:Version={version}
 after_build:
-- cmd: dotnet pack AuthorizeNETnetcore -c Release /property:Version=$env:APPVEYOR_BUILD_VERSION 
+- cmd: dotnet pack AuthorizeNETnetcore -c Release /property:Version={version}
 #- ps: choco/packit_appveyor.ps1
 #artifacts:
   #All Choco Packages