docs: fix links in readme

Signed-off-by: Harald Hoyer <[email protected]>

README.md

@@ -9,4 +9,4 @@ All package builds should be reproducible and therefore can be used to build rep
 ## Usage
 
 See: https://github.com/matter-labs/teepot
-and https://github.com/haraldh/docker-era-fee-withdrawer
+and https://github.com/matter-labs/era-fee-withdrawer/tree/gramine-sgx