Update resource list

Author: Autogenerator Pipeline

generator/resources.json

@@ -5353,6 +5353,24 @@
     "2020-08-01",
     "2020-11-01"
   ],
+  "Microsoft.Network/dnsForwardingRulesets": [
+    "2020-04-01-preview"
+  ],
+  "Microsoft.Network/dnsForwardingRulesets/forwardingRules": [
+    "2020-04-01-preview"
+  ],
+  "Microsoft.Network/dnsForwardingRulesets/virtualNetworkLinks": [
+    "2020-04-01-preview"
+  ],
+  "Microsoft.Network/dnsResolvers": [
+    "2020-04-01-preview"
+  ],
+  "Microsoft.Network/dnsResolvers/inboundEndpoints": [
+    "2020-04-01-preview"
+  ],
+  "Microsoft.Network/dnsResolvers/outboundEndpoints": [
+    "2020-04-01-preview"
+  ],
   "Microsoft.Network/dnsZones/CAA": [
     "2017-09-01",
     "2017-10-01",