Bump elmah.aspnet package to 2.0 alpha 3

This fixes problems with alpha 1 and 2 that were released too soon and
bundled AntiXss instead of defining it as a dependency.

Author: atifaziz

pkg/Elmah.AspNet.nuspec

@@ -2,7 +2,7 @@
 <package xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
     <metadata xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
         <id>elmah.aspnet</id>
-        <version>2.0.0-alpha001</version>
+        <version>2.0.0-alpha003</version>
         <title>ELMAH for ASP.NET</title>
         <authors>Atif Aziz</authors>
         <owners>Atif Aziz, James Driscoll</owners>