add ultralyticsplus config

config.json

@@ -1 +1 @@
-{"input_size": 640, "task": "instance-segmentation", "ultralyticsplus_version": "0.0.14", "ultralytics_version": "8.0.8", "model_type": "v8", "score_map50": 0.59408, "score_map50_mask": 0.58255}
+{"input_size": 640, "task": "instance-segmentation", "ultralyticsplus_version": "0.0.21", "ultralytics_version": "8.0.20", "model_type": "v8", "score_map50": 0.63834, "score_map50_mask": 0.62845}