add 'nullish'

coke · coke · commit 58db9e7bc5a2 · 2021-08-01T19:11:32.000-04:00
described here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing_operator
diff --git a/xt/pws/words.pws b/xt/pws/words.pws
@@ -933,6 +933,7 @@ nswap
 nswp
 ntop
 nul
+nullish
 num
 numericenumeration
 numerics
