Updated the win32 binary install instruction.

See issue #207

Author: ataffanel

win32install/readme.txt

@@ -1,3 +1,6 @@
+Warning: Generating windows executable is not working yet with Python3. This is
+work in progress in issue #207. Any help is apreciated!
+
 Howto generate cfclient Windows installer
 =========================================
 
@@ -50,4 +53,4 @@ Finally open the win32install folder in the file explorer. Right click on
 cfclient.nsi, chose "Compile NSIS script (choose compressor)". The NSIS
 compiler opens, Select "LZMA (solid)" compressor. After a little while
 the script is compiled and "cfclient-win32-install-version.exe" is created
-in the script folder.
+in the script folder.