feat(emoji-key): added "Data" contributors (#336)

docs/emoji-key.md

@@ -16,6 +16,7 @@ Emoji/Type | Represents | Comments
 💼 <br /> `business` | Business Development | people who execute on the business end
 💻 <br /> `code` | Code | links to commits by the user on this project
 🖋 <br /> `content` | Content | e.g. website copy, blog posts are separate
+🔣 <br /> `data` | Data | links to contributed data for the project (both tests and datasets)
 📖 <br /> `doc` | Documentation | links to commits by the user on this project, Wiki, or other source of documentation
 🎨 <br /> `design` | Design | links to the logo/iconography/visual design/etc.
 💡 <br /> `example` | Examples | links to the examples