Drop useless appveyor build recipe line

Author: nulltoken

appveyor.yml

@@ -61,7 +61,6 @@ test_script:
 - IF %ERRORLEVEL% NEQ 0 EXIT /B %ERRORLEVEL%
 
 on_success:
-- ps: |
 - ps: |
     & "C:\projects\libgit2sharp\nuget.package\BuildNugetPackage.ps1" "$env:APPVEYOR_REPO_COMMIT"
     Add-Type -Path "C:\projects\libgit2sharp\LibGit2Sharp\bin\Release\LibGit2Sharp.dll"