Fix zipfile name for coco128-segments (#4914)

data/scripts/get_coco128.sh

@@ -10,7 +10,7 @@
 # Download/unzip images and labels
 d='../datasets' # unzip directory
 url=https://github.com/ultralytics/yolov5/releases/download/v1.0/
-f='coco128.zip' # or 'coco2017labels-segments.zip', 68 MB
+f='coco128.zip' # or 'coco128-segments.zip', 68 MB
 echo 'Downloading' $url$f ' ...'
 curl -L $url$f -o $f && unzip -q $f -d $d && rm $f &