add back ember-try scenarios that were removed with ember-cli-update (#…

…1534)

* add back ember-try scenarios that were removed

* update readme to show support for older ember versions

.github/workflows/ci.yml

@@ -61,6 +61,8 @@ jobs:
       fail-fast: false
       matrix:
         try-scenario:
+          - ember-lts-3.16
+          - ember-lts-3.20
           - ember-lts-3.24
           - ember-lts-3.28
           - ember-release

README.md

@@ -13,8 +13,8 @@ ember-data collections and follows idiomatic patterns.
 
 ## Compatibility
 
-* Ember.js v3.24 or above
-* Ember CLI v3.24 or above
+* Ember.js v3.16 or above
+* Ember CLI v3.16 or above
 * Node.js v14 or above
 
 Ember Power Select 1.X works in Ember **2.3.1+**, beta and canary with no deprecations

config/ember-try.js

@@ -6,6 +6,24 @@ const { embroiderSafe, embroiderOptimized } = require('@embroider/test-setup');
 module.exports = async function () {
   return {
     scenarios: [
+      {
+        name: 'ember-lts-3.16',
+
+        npm: {
+          devDependencies: {
+            'ember-source': '~3.16.0',
+          },
+        },
+      },
+      {
+        name: 'ember-lts-3.20',
+
+        npm: {
+          devDependencies: {
+            'ember-source': '~3.20.0',
+          },
+        },
+      },
       {
         name: 'ember-lts-3.24',