Update to the .NET SDK 3.1

sharwell · sharwell · commit bfc6c0b78639 · 2020-09-03T14:30:44.000-07:00
diff --git a/global.json b/global.json
@@ -1,5 +1,6 @@
 {
   "sdk": {
-    "version": "2.1.504"
+    "version": "3.1.401",
+    "rollForward": "feature"
   }
 }
