[Travis] Attempt to fix build

requirements/dev.txt

@@ -1,4 +1,4 @@
-https://github.com/celery/vine/zipball/master
 https://github.com/celery/py-amqp/zipball/master
 https://github.com/celery/billiard/zipball/master
 https://github.com/celery/kombu/zipball/master
+https://github.com/celery/vine/zipball/master