Update NEWS

Author: hfrick

NEWS.md

@@ -11,6 +11,9 @@
 
 * For space-filling designs for $p$ parameters, there is a higher likelihood of finding a space-filling design for `1 < size <= p`. Also, single-point designs now default to a random grid (#363).
 
+* The `grid_*()` functions now error instead of warn when provided with the wrong argument to control the grid size. So `grid_space_filling()`, `grid_random()`, `grid_max_entropy()`, and `grid_latin_hypercube()` now error if used with a `levels` argument and `grid_regular()` now errors if used with a `size` argument (#368).
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 # dials 1.3.0
 
 ## Improvements