Use correct Makefile target name #75 (#77)

Correct "createsuperuse" target name that is missing an r.
 
Reported-by: Stefan @stefan6419846
Reference: #75

Signed-off-by: Philippe Ombredanne <pombredanne@nexb.com>

Makefile

@@ -164,4 +164,4 @@ log:
 createsuperuser:
 	${DOCKER_EXEC} web ./manage.py createsuperuser
 
-.PHONY: virtualenv conf dev envfile check bandit isort black doc8 valid check-docstrings check-deploy clean initdb postgresdb migrate run test docs build psql bash shell log createsuperuse
+.PHONY: virtualenv conf dev envfile check bandit isort black doc8 valid check-docstrings check-deploy clean initdb postgresdb migrate run test docs build psql bash shell log createsuperuser