drop support for Ember < 3.28 and Ember classic

.github/workflows/ci.yml

@@ -55,12 +55,10 @@ jobs:
       fail-fast: false
       matrix:
         try-scenario:
-          - ember-lts-3.24
           - ember-lts-3.28
           # - ember-release
           # - ember-beta
           # - ember-canary
-          - ember-classic
           - embroider-safe
           - embroider-optimized
 

README.md

@@ -12,8 +12,8 @@ Compatibility
 
 * Ember Bootstrap v5 or above
 * Ember Changeset and Ember Changeset Validations v4
-* Ember.js v3.24 or above
-* Ember CLI v3.24 or above
+* Ember.js v3.28 or above
+* Ember CLI v3.28 or above
 * Node.js v12 or above
 
 

config/ember-try.js

@@ -7,14 +7,6 @@ module.exports = async function () {
   return {
     useYarn: true,
     scenarios: [
-      {
-        name: 'ember-lts-3.24',
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.24.3',
-          },
-        },
-      },
       {
         name: 'ember-lts-3.28',
         npm: {
@@ -47,24 +39,6 @@ module.exports = async function () {
           },
         },
       },
-      {
-        name: 'ember-classic',
-        env: {
-          EMBER_OPTIONAL_FEATURES: JSON.stringify({
-            'application-template-wrapper': true,
-            'default-async-observers': false,
-            'template-only-glimmer-components': false,
-          }),
-        },
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.28.0',
-          },
-          ember: {
-            edition: 'classic',
-          },
-        },
-      },
       embroiderSafe(),
       embroiderOptimized(),
     ],