Drop Debian 10 and Ubuntu 18.04 support

Author: evgeni

metadata.json

@@ -107,14 +107,12 @@
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "18.04",
         "20.04"
       ]
     },
     {
       "operatingsystem": "Debian",
       "operatingsystemrelease": [
-        "10",
         "11"
       ]
     },

spec/spec_helper_methods.rb

@@ -9,11 +9,11 @@ def baseline_os_hash
       },
       {
         'operatingsystem' => 'Debian',
-        'operatingsystemrelease' => %w[10 11]
+        'operatingsystemrelease' => %w[11]
       },
       {
         'operatingsystem' => 'Ubuntu',
-        'operatingsystemrelease' => %w[18.04 20.04]
+        'operatingsystemrelease' => %w[20.04]
       },
       {
         'operatingsystem' => 'Archlinux',