Update Json.NET to 9.0.1

Author: javiercn

src/Microsoft.AspNetCore.Authentication.OAuth/project.json

@@ -22,7 +22,7 @@
  },
  "dependencies": {
  "Microsoft.AspNetCore.Authentication": "1.0.0-*",
- "Newtonsoft.Json": "9.0.1-beta1"
+ "Newtonsoft.Json": "9.0.1"
  },
  "frameworks": {
  "net451": {},

src/Microsoft.AspNetCore.Authentication.Twitter/project.json

@@ -22,7 +22,7 @@
  },
  "dependencies": {
  "Microsoft.AspNetCore.Authentication": "1.0.0-*",
- "Newtonsoft.Json": "9.0.1-beta1"
+ "Newtonsoft.Json": "9.0.1"
  },
  "frameworks": {
  "net451": {},