Fix #68: Update Debian/Ubuntu packaging

- Bump debhlper compat to >= 10 (Stretch)
- Update Standards-Version field, we seem to be compatible
- Update package Description filed, lintian complains of empty body
- Update changelog date and drop GitHub issue reference, confuses lintian

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

debian/changelog

 light (1.2) unstable; urgency=low
 
-  * Initial Debian Release (Closes: #47)
+  * Initial Debian Release.
 
- -- Joachim Nilsson <troglobit@gmail.com>  Sun, 12 Aug 2018 22:15:00 +0100
+ -- Joachim Nilsson <troglobit@gmail.com>  Sat, 22 Sep 2018 11:53:32 +0200
 

debian/compat

-9
+10

debian/control

 Priority: optional
 Maintainer: Joachim Nilsson <troglobit@gmail.com>
 Homepage: https://github.com/haikarainen/light
-Build-Depends: debhelper (>= 9~), autoconf
+Build-Depends: debhelper (>= 10)
 Vcs-Git: https://github.com/haikarainen/light.git
 Vcs-Browser: https://github.com/haikarainen/light/commits/
-Standards-Version: 3.9.3
+Standards-Version: 4.2.1
 
 Package: light
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
-Description: a program to control backlight controllers under GNU/Linux
+Description: Control display backlight controllers and LEDs
+ Light is a useful tool to control display brightness in lightweight
+ desktops or window managers that do not have bundled appliations for
+ this purpose.
+ .
+ Most modern laptops have moved away from hardware controlled brightness
+ and require software control.  Light works where other software has
+ proven to be unreliable, e.g. xbacklight.  It can even be used from the
+ console as it does not rely on X.
+ .
+ Light has features like setting a minimum brightness value, as well as
+ saving and restoring the brightness at reboot and startup.