mention disablePerMessageDeflate in the doc

docs/CHANGELOG.md

@@ -2,6 +2,10 @@
 
 All changes to this project will be documented in this file.
 
+## [11.1.0] - 2021-03-16
+
+(ixwebsocket) Use LEAN_AND_MEAN Windows define to help with undefined link error when building a DLL. Support websocket server disablePerMessageDeflate option correctly.
+
 ## [11.0.9] - 2021-03-07
 
 (ixwebsocket) Expose setHandshakeTimeout method

docs/usage.md

@@ -343,6 +343,10 @@ if (!res.first)
     return 1;
 }
 
+// Per message deflate connection is enabled by default. It can be disabled
+// which might be helpful when running on low power devices such as a Rasbery Pi
+server.disablePerMessageDeflate();
+
 // Run the server in the background. Server can be stoped by calling server.stop()
 server.start();
 
@@ -410,6 +414,10 @@ if (!res.first)
     return 1;
 }
 
+// Per message deflate connection is enabled by default. It can be disabled
+// which might be helpful when running on low power devices such as a Rasbery Pi
+server.disablePerMessageDeflate();
+
 // Run the server in the background. Server can be stoped by calling server.stop()
 server.start();