Fixed tab/space issue in appveyor.yml

Author: Noah Potash

appveyor.yml

@@ -3,7 +3,7 @@ image: Visual Studio 2015
 build_script:
 - cmd: >-
     move Source\MySql.Data Source\SapientGuardian.MySql.Data
-	dotnet restore -v Warning	
+    dotnet restore -v Warning	
     dotnet pack .\Source\SapientGuardian.MySql.Data -o .\artifacts\SapientGuardian.MySql.Data -c Release
 artifacts:
 - path: 'artifacts\**\*.nupkg'