Use .net 5 release sdk

Swoorup · TheAngryByrd · commit 5abfd3b6e0b6 · 2020-11-18T11:26:24.000-05:00
diff --git a/global.json b/global.json
@@ -1,5 +1,5 @@
 {
   "sdk": {
-    "version": "5.0.100-preview.2.20176.6"
+    "version": "5.0.100"
   }
-}
+}
