release RTCDet-M on COCO

models/detectors/rtcdet/README.md

@@ -5,7 +5,7 @@
 | RTCDet-N |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |
 | RTCDet-T |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |
 | RTCDet-S |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |
-| RTCDet-M |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |
+| RTCDet-M |  640  | 8xb16 |                         |                    |           48.7         |       67.6        |        80.3       |          22.6      |  |
 | RTCDet-L |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |
 | RTCDet-X |  640  | 8xb16 |                         |                    |                        |                   |                   |                    |  |