template-lint: Enable require-valid-alt-text rule

Author: Turbo87

.template-lintrc.js

@@ -6,7 +6,6 @@ module.exports = {
   extends: 'octane',
 
   rules: {
-    'require-valid-alt-text': false,
     'no-action': false,
   },
 };

app/templates/dashboard.hbs

@@ -62,7 +62,7 @@
 
       {{#if this.loadMoreTask.isRunning}}
         <span local-class='load-more'>
-          <img src="/assets/ajax-loader.gif">
+          <img src="/assets/ajax-loader.gif" alt="Loading">
         </span>
       {{else}}
         {{#if this.hasMore}}