drop Ubuntu 16.04 support

Ubuntu 16.04 standard support ends in a few weeks. Including Ubuntu 16.04 support causes our acceptance tests to hang. See #334 (comment) for details. Also update some versions in the README.
voxpupuli · Feb 15, 2021 · 549bf8f · 549bf8f
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commit 549bf8f
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diff --git a/README.md b/README.md
@@ -716,18 +716,17 @@ enabled in order to upgrade to new JIRA versions smoothly.
 
 ## Limitations
 
-* Puppet 3.8.7+
+* Puppet 5.5.8+
 * Puppet Enterprise
 
 The puppetlabs repositories can be found at:
 <http://yum.puppetlabs.com/> and <http://apt.puppetlabs.com/>
 
-* RedHat 6/7
-* CentOS 6/7
-* Scientific 6/7
-* Oracle Linux 6/7
-* Ubuntu 12.04/14.04
-* Debian 7
+* RedHat 7
+* CentOS 7
+* Scientific 7
+* Oracle Linux 7
+* Ubuntu 18.04
 
 * PostgreSQL
 * MySQL 5.x

diff --git a/metadata.json b/metadata.json
@@ -59,7 +59,6 @@
     {
       "operatingsystem": "Ubuntu",
       "operatingsystemrelease": [
-        "16.04",
         "18.04"
       ]
     }