Remove 2.x compatibility

Author: btecu

.travis.yml

@@ -49,7 +49,6 @@ jobs:
     # we recommend new addons test the current and previous LTS
     # as well as latest stable release (bonus points to beta/canary)
     - stage: "Additional Tests"
-      env: EMBER_TRY_SCENARIO=ember-lts-2.18
     - env: EMBER_TRY_SCENARIO=ember-lts-3.4
     - env: EMBER_TRY_SCENARIO=ember-release
     - env: EMBER_TRY_SCENARIO=ember-beta

config/ember-try.js

@@ -11,18 +11,6 @@ module.exports = function() {
     return {
       useYarn: true,
       scenarios: [
-        {
-          name: 'ember-lts-2.18',
-          env: {
-            EMBER_OPTIONAL_FEATURES: JSON.stringify({ 'jquery-integration': true })
-          },
-          npm: {
-            devDependencies: {
-              '@ember/jquery': '^0.5.1',
-              'ember-source': '~2.18.0'
-            }
-          }
-        },
         {
           name: 'ember-lts-3.4',
           npm: {