fixing Lagos sponsor image

Author: datapythonista

pandas/assets/images/sponsors/univelcity.png

@@ -322,7 +322,7 @@
             {"title": "Lagos",
              "description": "PyData Lagos",
              "url": "https://www.meetup.com/PyData-Lagos/events/248337266/",
-             "sponsor_image": "http://univelcity.com/wp-content/uploads/2017/10/logo.png",
+             "sponsor_image": "univelcity.png",
              "sponsor_url": "http://univelcity.com/",
              "time": "10:00AM",
              "address": "42 Montgomery Road, Yaba, Lagos, Nigeria",