update the link

Author: cjhdev

readme.md

@@ -21,7 +21,7 @@ only supports client roles. Call it a work in progress.
 - works with any transport layer you like
 - automatic payload fragmentation on receive
 - trivial to integrate with an existing build system
-- [mbed wrapper](examples/mbed)
+- [mbed wrapper](port/mbed)
 
 ## Limitations