Ignore no-at-ember-render-modifiers linting rule

As this is the entire point of this code

Author: jrjohnson

.template-lintrc.js

@@ -2,4 +2,7 @@
 
 module.exports = {
   extends: 'recommended',
+  rules: {
+    'no-at-ember-render-modifiers': false,
+  },
 };