Clean up nuget.config

Author: bording

Diff for: .editorconfig

@@ -14,5 +14,5 @@ insert_final_newline = true
 trim_trailing_whitespace = false
 insert_final_newline = false
 
-[*.{props,targets,csproj}]
+[*.{props,targets,csproj,config}]
 indent_size = 2

Diff for: nuget.config

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