Update data.json

Author: baisong

web/data.json

@@ -71,7 +71,7 @@
 	"description": "A social platform for organizations and activists to motivate everyday people to connect with each other and take progressive action.",
 	"site_url": "http://magnifyprogress.com",
 	"project_url": "",
-	"site_image": "/img/projects/magnify_progress.png",
+	"site_image": "/img/projects/magnify.png",
 	"is_featured": "TRUE",
 	"channel": "#magnify-progress"
 }, {