Add dkms build dependancy as requirement for the PPA

Author: doctormo

debian/control

@@ -2,7 +2,7 @@ Source: digimend-dkms
 Section: kernel
 Priority: extra
 Maintainer: Nikolai Kondrashov <spbnick@gmail.com>
-Build-Depends: debhelper (>= 9)
+Build-Depends: debhelper (>= 9), dkms
 Standards-Version: 3.9.5
 Homepage: https://github.com/DIGImend/digimend-kernel-drivers
 Vcs-Git: https://github.com/DIGImend/digimend-kernel-drivers.git