Update NEWS.md

[ci skip]

Author: jgabry

NEWS.md

@@ -7,7 +7,7 @@
 <!-- Items for next release go here* -->
 
 * ColorBrewer palettes are now available as color schemes via
-  [`color_scheme_set()`](https://mc-stan.org/bayesplot/reference/bayesplot-colors.html). (#177)
+  [`color_scheme_set()`](https://mc-stan.org/bayesplot/reference/bayesplot-colors.html). (#177,#190)
 
 * MCMC plots now also accept objects with an `as.array` method as 
   input (e.g., stanfit objects). (#175, #184)