Resolve "MAS-DT define instruction set and instructions"

Closes #62 (closed)

formats/instruction_set.py

             "type": "string",
             "description": "MIME type",
             "example": "text/plain",
-        }
+        },
     },
     "required": ["name", "content"],
 }
         "files": {
             "type": "array",
             "items": config_file_schema,
-        },        
+        },
     },
     "required": [
         "message_type",