Update README.md

i forgot that the readme is wrong

README.md

 
 ```
 REGISTRATION: False # only set to True if in a development situation, or to create your first user
-UPLOAD_FOLDER = '/uploads'
+UPLOAD_FOLDER = 'myriad/static/icons'
 ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif'}
 ```