update boolean to bool

Author: MBueschelberger

dsms/knowledge/utils.py

@@ -45,7 +45,7 @@
     "Radio": "string",
     "Select": "string",
     "File": "string",
-    "Checkbox": "boolean",
+    "Checkbox": "bool",
     "Knowledge item": "anyURI",
     "VocabularyTerm": "anyURI",
 }