Update packages' versions

Author: troydai

src/Microsoft.Framework.Logging.Console/project.json

@@ -13,7 +13,7 @@
         "dnx451": { },
         "dotnet": {
             "dependencies": {
-                "System.Runtime": "4.0.20.0",
+                "System.Runtime": "4.0.21-beta-*",
                 "System.Console": "4.0.0-beta-*",
                 "System.IO": "4.0.11-beta-*",
                 "System.Threading": "4.0.11-beta-*"