ChangeLog.txt:  Change release date to Nov 11.
apps/tools: Fix to generate CONFIG_SYSTEM_NSH_SYMTAB_COUNTNAME in
mksymtab.sh. From Masayuki Ishikawa (2018-09-07)
-7.27 2018-11-15 Gregory Nutt <gnutt@nuttx.org>
+7.27 2018-11-14 Gregory Nutt <gnutt@nuttx.org>
* Directory.mk: Fix distclean targets of directory makefiles was not
removing generated Kconfig files. There is then no way to remove this
