update NEWS.md with recent changes (#2886)
update NEWS.md with recent changes (#2886)

* update NEWS.md with recent changes

Signed-off-by: Yitao Li <506e136862ca6a2cd6209c2ab7376874a235e7c2@rstudio.com>

* revise description of dbplyr-related change as Sigrid suggested

Signed-off-by: Yitao Li <506e136862ca6a2cd6209c2ab7376874a235e7c2@rstudio.com>
rstudio/sparklyr,rstudio/sparklyr,rstudio/sparklyr,rstudio/sparklyr