drop support for Ember < 3.16

Author: mansona

.github/workflows/ci.yml

@@ -62,7 +62,6 @@ jobs:
       fail-fast: false
       matrix:
         try-scenario:
-          - ember-lts-3.12
           - ember-lts-3.16
           - ember-lts-3.20
           - ember-lts-3.24

README.md

@@ -16,9 +16,10 @@ When using this addon, you get to work with objects in your domain layer, just l
 
 ## Compatibility
 
-- Ember.js v3.12 or above
+- Ember.js v3.16 or above
 - Embroider or ember-auto-import v2
 
+- Use 0.9.0-beta.0 if you need to support Ember 3.12
 - Use 0.8.2 if you need to support a Ember 2.X or version less than Ember 3.12
 
 ## Installation

test-app/config/ember-try.js

@@ -7,16 +7,6 @@ module.exports = async function () {
   return {
     usePnpm: true,
     scenarios: [
-      {
-        name: 'ember-lts-3.12',
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.12.0',
-            'ember-cli': '^4.12.0',
-            '@ember/test-helpers': '^2.0.0',
-          },
-        },
-      },
       {
         name: 'ember-lts-3.16',
         npm: {