Update README.md

mapping link fixed

README.md

@@ -16,7 +16,7 @@ Now I am able to use a fully automated testing approach instead of doing it 100%
 **Important**: 
 
 The Transpiler only supports a small subset of the [Golang Language Specification](https://golang.org/ref/spec).
-Look at the [mapping](https://github.com/andygeiss/esp32-transpiler/blob/master/impl/worker/mapping.go) and the [tests](https://github.com/andygeiss/esp32-transpiler/blob/master/impl/worker/worker_test.go) to get the current functionality.
+Look at the [mapping](https://github.com/andygeiss/esp32-transpiler/blob/master/transpile/mapping.go) and the [tests](https://github.com/andygeiss/esp32-transpiler/blob/master/impl/worker/worker_test.go) to get the current functionality.
 It is also not possible to trigger the C/C++ Garbage Collection, because Golang handles it automatically "under the hood".
 Go strings will be transpiled to C constant char arrays, which could be handled on the stack.