Fixed the build

Author: davidfowl

test/Microsoft.AspNetCore.Cors.Test/project.json

@@ -5,15 +5,16 @@
     "Microsoft.AspNetCore.Cors": "1.0.0-*",
     "Microsoft.AspNetCore.TestHost": "1.0.0-*",
     "Microsoft.Extensions.Logging.Testing": "1.0.0-*",
-    "Microsoft.NETCore.Platforms": "1.0.1-*",
     "xunit": "2.1.0"
   },
   "testRunner": "xunit",
   "frameworks": {
     "netstandardapp1.5": {
       "dependencies": {
         "dotnet-test-xunit": "1.0.0-dev-*",
-        "moq.netcore": "4.4.0-beta8"
+        "moq.netcore": "4.4.0-beta8",
+        "NETStandard.Library": "1.5.0-*",
+        "System.Diagnostics.Process": "4.1.0-*"
       },
       "imports": [
         "dnxcore50",