fixup readme

hack/tools/prowjob-gen/README.md

@@ -18,7 +18,7 @@ Flags:
 When running prowjob-gen, all flags need to be provided.
 The tool then will iterate over all templates defined in the config file and execute them per configured branch.
 
-The configuration file is supposed to be in yaml format and to be stored inside the [test-infra](github.com/kubernetes/test-infra)
+The configuration file is supposed to be in yaml format and to be stored inside the [test-infra](https://github.com/kubernetes/test-infra)
 repository, we have to make sure it is not getting parsed as configuration for prow.
 Because of that the top-level key for the configuration file is `prow-ignored:`.