Merge pull request #82 from aspnet/feed-update-master

[master] NuGet Feed Update

.nuget/NuGet.Config

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
+    <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
   </packageSources>
 </configuration>

NuGet.Config

@@ -1,9 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
-    <!--Use this configuration file to get preview packages from other
-    sources like MyGet -->
+    <clear />
     <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="Net Core Feed" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/3.0.100-rc2-014277/nuget/v3/index.json" />
   </packageSources>
 </configuration>