Update to v5.2.0 of Microsoft.NETCore.UniversalWindowsPlatform

src/Renci.SshNet.UAP10/project.json

@@ -1,6 +1,6 @@
 {
   "dependencies": {
-    "Microsoft.NETCore.UniversalWindowsPlatform": "5.1.0",
+    "Microsoft.NETCore.UniversalWindowsPlatform": "5.2.0",
     "SshNet.Security.Cryptography": "1.2.0",
     "System.Xml.XPath.XmlDocument": "4.0.1"
   },