We have to drop support for ember less than v4

Author: NullVoxPopuli

.github/workflows/ci-build.yml

@@ -100,8 +100,7 @@ jobs:
         app: 
           - test-apps/base-tests
         ember-try-scenario:
-          - ember-lts-3.16
-          - ember-lts-3.28
+          - ember-4.0
           - ember-lts-4.12
           - ember-lts-5.12
           - ember-release

README.md

@@ -49,6 +49,7 @@ This addon implements the design specified in [RFC 581](https://github.com/ember
 - `ember-auto-import` or embroider 
 - `ember-source` v4 or above
 - `@ember/test-helpers` v3 or above
+- `ember-qunit` v7 or above
 
 ## Installation
 

test-apps/base-tests/config/ember-try.js

@@ -7,31 +7,11 @@ module.exports = async function () {
     usePnpm: true,
     scenarios: [
       {
-        name: 'ember-lts-3.16',
+        name: 'ember-4.0',
         npm: {
           devDependencies: {
-            'ember-source': '~3.16.0',
-            '@ember/string': '^3.0.0',
-            '@ember/test-helpers': '^3.0.0',
+            'ember-source': '~4.0.0',
             '@glimmer/component': '^1.0.0',
-            'ember-cli': '~3.28.0',
-            'ember-cli-app-version': '^5.0.0',
-            'ember-qunit': '^5.0.0',
-            'ember-resolver': '~8.0.0',
-          },
-        },
-      },
-      {
-        name: 'ember-lts-3.28',
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.28.11',
-            '@ember/string': '^3.0.0',
-            '@ember/test-helpers': '^3.0.0',
-            '@glimmer/component': '^1.0.0',
-            'ember-cli': '~3.28.0',
-            'ember-qunit': '^6.0.0',
-            'ember-resolver': '~8.0.0',
           },
         },
       },