Nuget.Config surpport http

NuGet.Config

@@ -1,7 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <packageSources>
-    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" />
-    <add key="fengwo.org" value="http://110.188.24.182:5555/v3/index.json" />
+    <clear />
+    <add key="nuget.org" value="https://api.nuget.org/v3/index.json"  protocolVersion="3"/>
+    <add key="fengwo.org" value="http://110.188.24.182:5555/v3/index.json" allowInsecureConnections="true"/>
   </packageSources>
 </configuration>