drop support for Ember < 3.16

Author: jelhan

.travis.yml

@@ -47,7 +47,6 @@ jobs:
 
     # we recommend new addons test the current and previous LTS
     # as well as latest stable release (bonus points to beta/canary)
-    - env: EMBER_TRY_SCENARIO=ember-3.13
     - env: EMBER_TRY_SCENARIO=ember-lts-3.16
     - env: EMBER_TRY_SCENARIO=ember-release
     - env: EMBER_TRY_SCENARIO=ember-beta

README.md

@@ -12,7 +12,7 @@ Compatibility
 
 * Ember Bootstrap v3
 * Ember Changeset and Ember Changeset Validations v2
-* Ember.js v3.13 or above
+* Ember.js v3.16 or above
 * Ember CLI v2.13 or above
 * Node.js v10 or above
 

config/ember-try.js

@@ -6,14 +6,6 @@ module.exports = async function() {
   return {
     useYarn: true,
     scenarios: [
-      {
-        name: 'ember-3.13',
-        npm: {
-          devDependencies: {
-            'ember-source': '~3.13.0'
-          }
-        }
-      },
       {
         name: 'ember-lts-3.16',
         npm: {