Packaging maintenance

* Declare compliance with policy 4.2.1
* Bump to debhelper compat level 11
* Update years in copyright

debian/compat

@@ -1 +1 @@
-10
+11

debian/control

@@ -1,10 +1,10 @@
 Source: ykush-control
 Maintainer: Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 Homepage: https://github.com/Yepkit/ykush
-Standards-Version: 3.9.8
-Build-Depends: debhelper (>= 10~),
-    pandoc,
+Standards-Version: 4.2.1
+Build-Depends: debhelper (>= 11~),
     libhidapi-dev,
+    pandoc,
 Priority: extra
 Section: utils
 

debian/copyright

@@ -1,8 +1,8 @@
 Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Source: https://github.com/Yepkit/ykush
 Files-Excluded:
-    ykushcmd/linux
-    ykushcmd/windows
+ ykushcmd/linux
+ ykushcmd/windows
 
 Files: *
 Copyright: 2015-2017 Yepkit Lda
@@ -10,7 +10,7 @@ License: MIT
 
 Files:
  debian/*
-Copyright: 2017 Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
+Copyright: 2017-2018 Christoph Biedl <debian.axhn@manchmal.in-ulm.de>
 License: MIT
 
 License: MIT