make a field readonly

Author: honfika

src/Titanium.Web.Proxy/StreamExtended/Network/CustomBufferedStream.cs

@@ -23,7 +23,7 @@ public class CustomBufferedStream : Stream, ICustomStreamReader
         // default to UTF-8
         private static readonly Encoding encoding = Encoding.UTF8;
 
-        private static bool networkStreamHack = true;
+        private static readonly bool networkStreamHack = true;
 
         private int bufferLength;