Add recent LTS versions

Author: chancancode

.github/workflows/build.yml

@@ -26,6 +26,9 @@ jobs:
           - release
           - beta
           - canary
+          - lts-3.16
+          - lts-3.12
+          - lts-3.8
           - lts-3.4
           - lts-2.18
     steps:

config/ember-try.js

@@ -31,6 +31,30 @@ module.exports = function() {
             }
           }
         },
+        {
+          name: 'ember-lts-3.8',
+          npm: {
+            devDependencies: {
+              'ember-source': '~3.8.0'
+            }
+          }
+        },
+        {
+          name: 'ember-lts-3.12',
+          npm: {
+            devDependencies: {
+              'ember-source': '~3.12.0'
+            }
+          }
+        },
+        {
+          name: 'ember-lts-3.16',
+          npm: {
+            devDependencies: {
+              'ember-source': '~3.16.0'
+            }
+          }
+        },
         {
           name: 'ember-release',
           npm: {