ChangeLog.txt:  Change the release back to 7/21.
* apps/graphics/twm4ndx: Compile out cursor support if we are using a
mouse From Gregory Nutt (2019-05-17).
-7.31 2019-07-22 Gregory Nutt <gnutt@nuttx.org>
+7.31 2019-07-21 Gregory Nutt <gnutt@nuttx.org>
* Remove some cases in Kconfig files of 'comment' with 'depends on'. That
is probably a good practice. I removed these because (1) is not done
