capturing error code from curl

Author: ricardorg79

Makefile

@@ -20,7 +20,9 @@ unit-test:
 
 deploy:
 	$(eval VERSION = v$(shell cat VERSION).$(TRAVIS_BUILD_NUMBER)+$(shell git log --format=%h -1))
-	@curl -H "Authorization: Bearer $(GHK)" \
+	@echo curl -d '{ "tag_name": "$(VERSION)", "target_commitish": "$(TRAVIS_COMMIT)", "name": "$(VERSION)", "body": "Automatic Release of $(VERSION)", "draft": false, "prerelease": false }' \
+		"https://api.github.com/repos/$(SLUG)/releases"
+	@curl -f -H "Authorization: Bearer $(GHK)" \
 		-d '{ "tag_name": "$(VERSION)", "target_commitish": "$(TRAVIS_COMMIT)", "name": "$(VERSION)", "body": "Automatic Release of $(VERSION)", "draft": false, "prerelease": false }' \
 		"https://api.github.com/repos/$(SLUG)/releases"