misc: update NEWS.md with reference to mailing lists and duplicate entry removal.

NEWS.md

@@ -2,13 +2,14 @@
 
 ## Version 4.2.0 - TBA
 
+* There are now two mailing lists (on SourceForge), see `README.md`.
 * Adaptive-N-factor algorithm support (by _Bufius_, _Zuikkis_ and
   _veox_). For details on choosing the algorithm, see
   `doc/configuration.md`.
-* Setting pool name with `poolname` is deprecated. Use `name` instead.
 * Allowed kernel names are no longer hard-coded. It is now possible to
   use any `.cl` file.
 * Configuration parameter `poolname` has been renamed to `name`.
+  `poolname` is deprecated and will be removed in a future version.
 * Multiple `--name` parsing should now work as expected (by _troky_).
 * `--coin` configuration parameter to specify a freeform pool
   description (by _troky_).