BREAKING: Remove support for Debian 9 and Ubuntu 16.04

- Deprecate Debian 9 and Ubuntu 16.04
- Add support for Debian 10

Signed-off-by: William Yardley <[email protected]>

Author: wyardley

metadata.json

@@ -23,13 +23,12 @@
     {
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
-        "9"
+        "10"
       ]
     },
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "16.04",
         "18.04"
       ]
     },