Update packager.io dependencies and targets.

.pkgr.yml

@@ -1,11 +1,13 @@
+dependencies:
+  - libreadline-dev
+  - libssl-dev
+  - bsdtar
 targets:
-  ubuntu-19.04:
   ubuntu-18.04:
   ubuntu-16.04:
   ubuntu-14.04:
   centos-6:
   centos-7:
   debian-10:
-  debian-9:
   sles-12:
   sles-11: