Update release_notes.sh
# a simple little utility to list PRs for release notes:
# Run ./hack/release_notes.sh --help for more info
-go build -o out/listpullreqs ./hack/release_note/listpullreqs.go
+go build -o out/listpullreqs ./hack/release_notes/listpullreqs.go
chmod +x out/listpullreqs
out/listpullreqs $@
