Add new sponsor (yay!)

Author: pixelyunicorn

data/new-york.yaml

@@ -23,6 +23,9 @@ sponsors:
   - name: Heroku
     link: https://www.heroku.com/
     media: https://i.imgur.com/2BONYjO.png
+  - name: Contentful
+    link: https://www.contentful.com
+    media: https://camo.githubusercontent.com/ff269864dd78d3ccb185b7c49afbbb90fe46dd7b/68747470733a2f2f6d6176656e732e636f6d2f77702d636f6e74656e742f75706c6f6164732f323031352f30392f6c6f676f2d636f6e74656e7466756c2e706e67
 speakers:
   - name: Melody ✨
     twitterLink: pixelyunicorn