Release Spot 2.8.6

* NEWS, configure.ac, doc/org/setup.org: Update version.

NEWS

-New in spot 2.8.5.dev (not yet released)
+New in spot 2.8.6 (2020-02-19)
 
   Bugs fixed:
 

configure.ac

@@ -21,7 +21,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 AC_PREREQ([2.63])
-AC_INIT([spot], [2.8.5.dev], [spot@lrde.epita.fr])
+AC_INIT([spot], [2.8.6], [spot@lrde.epita.fr])
 AC_CONFIG_AUX_DIR([tools])
 AC_CONFIG_MACRO_DIR([m4])
 AM_INIT_AUTOMAKE([1.11 gnu tar-ustar color-tests parallel-tests])

doc/org/setup.org

 #+OPTIONS: H:2 num:nil toc:t html-postamble:nil ^:nil
 #+EMAIL: spot@lrde.epita.fr
 #+HTML_LINK_HOME: index.html
-#+MACRO: SPOTVERSION 2.8.5
-#+MACRO: LASTRELEASE 2.8.5
-#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.8.5.tar.gz][=spot-2.8.5.tar.gz=]]
-#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-8-5/NEWS][summary of the changes]]
-#+MACRO: LASTDATE 2020-01-04
+#+MACRO: SPOTVERSION 2.8.6
+#+MACRO: LASTRELEASE 2.8.6
+#+MACRO: LASTTARBALL [[http://www.lrde.epita.fr/dload/spot/spot-2.8.6.tar.gz][=spot-2.8.6.tar.gz=]]
+#+MACRO: LASTNEWS [[https://gitlab.lrde.epita.fr/spot/spot/blob/spot-2-8-6/NEWS][summary of the changes]]
+#+MACRO: LASTDATE 2020-02-19
 
 #+ATTR_HTML: :id spotlogo
 [[file:spot2.svg]]