Fix fabric.p4 link in README

Fixes #46

Author: antoninbas

README.md

@@ -83,7 +83,7 @@ e.g. `table_entry?`.
 ## Example usage
 
 Here is some of what you can do when using p4runtime-sh with ONF's
-[fabric.p4](https://github.com/opennetworkinglab/onos/blob/master/pipelines/fabric/src/main/resources/fabric.p4).
+[fabric.p4](https://github.com/opennetworkinglab/onos/blob/master/pipelines/fabric/impl/src/main/resources/fabric.p4).
 
 More examples of usage can be found in the [usage/ folder](usage/).