Fix small typo in README

Author: Maschell

README.md

@@ -21,4 +21,4 @@ docker run -it --rm -v ${PWD}:/project loggingmodule-builder make clean
 ```
 ## Format the code via docker
 
-`docker run --rm -v ${PWD}:/src ghcr.io/wiiu-env/clang-format:13.0.0-2 -r ./src -i`
+`docker run --rm -v ${PWD}:/src ghcr.io/wiiu-env/clang-format:13.0.0-2 -r ./source -i`