[BUGFIX beta] Comment out IE11 for new apps to avoid deprecation

ember-source warns about having IE11 in targets, so we are removing
it from the blueprints for a better out-of-the-box experience. In
order to make it easier to notice for apps running ember-cli-update
a big block of comment was added so it's more likely to be caught.

blueprints/app/files/config/targets.js

@@ -6,12 +6,20 @@ const browsers = [
   'last 1 Safari versions',
 ];
 
-const isCI = Boolean(process.env.CI);
-const isProduction = process.env.EMBER_ENV === 'production';
-
-if (isCI || isProduction) {
-  browsers.push('ie 11');
-}
+// Ember's browser support policy is changing, and IE11 support will end in
+// v4.0 onwards.
+//
+// See https://deprecations.emberjs.com/v3.x#toc_3-0-browser-support-policy
+//
+// If you need IE11 support on a version of Ember that still offers support
+// for it, uncomment the code block below.
+//
+// const isCI = Boolean(process.env.CI);
+// const isProduction = process.env.EMBER_ENV === 'production';
+//
+// if (isCI || isProduction) {
+//   browsers.push('ie 11');
+// }
 
 module.exports = {
   browsers,

tests/acceptance/new-test.js

@@ -156,7 +156,7 @@ describe('Acceptance: ember new', function () {
     await ember(['new', 'foo', '--skip-npm', '--skip-bower']);
 
     process.env.CI = true;
-    const defaultTargets = require('../../lib/utilities/default-targets').browsers;
+    const defaultTargets = ['last 1 Chrome versions', 'last 1 Firefox versions', 'last 1 Safari versions'];
     const blueprintTargets = require(path.resolve('config/targets.js')).browsers;
     expect(blueprintTargets).to.have.same.deep.members(defaultTargets);
   });