Fix path in Makefile
Fix
OCR-D/pyocrd#62
@@ -62,7 +62,7 @@ ocrd-spec:
git clone https://github.com/OCR-D/spec "$@"
ocrd/model/yaml/ocrd_oas3.spec.yml: ocrd-spec
- cp ocrd-spec/ocrd_api.swagger.yaml "$@"
+ cp ocrd-spec/ocrd_api.swagger.yml "$@"
#
# Assets
