Fixed the asp.net core signed package

Author: niemyjski

src/Platforms/Exceptionless.AspNetCore.Signed/project.json

@@ -57,6 +57,7 @@
         "Exceptionless.Signed": {
             "target": "project"
         },
+        "Microsoft.AspNetCore.Hosting.Abstractions": "1.0.0",
         "Microsoft.AspNetCore.Http": "1.0.0",
         "Microsoft.AspNetCore.Http.Abstractions": "1.0.0",
         "Microsoft.AspNetCore.Http.Extensions": "1.0.0",