chore: remove keyword

Signed-off-by: Athan <[email protected]>

Author: kgryte

lib/node_modules/@stdlib/stats/nanmean/package.json

@@ -60,7 +60,6 @@
     "mean",
     "arithmetic mean",
     "central tendency",
-    "extent",
     "ndarray"
   ],
   "__stdlib__": {}