Update setup.py

Author: fsbraun

setup.py

@@ -10,7 +10,7 @@
     'djangocms-attributes-field>=1',
     'djangocms-text-ckeditor>=3.1.0',
     'djangocms-icon>=1.4.0',
-    'djangocms-link>=2.5.0',
+    'djangocms-link>=2.5.0,<5',
     'djangocms-picture>=2.3.0',
 ]