Change NEWS documentation from reST to Markdown

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Update NEWS to Markdown syntax and add info on next release.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>
Bump version for 1.10 release.

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>