CI should build now

src/NadekoBot/NuGet.Config

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