build(): Fix lint errors

Author: maltsev

.eslintrc

@@ -14,8 +14,5 @@
         "browser": false,
         "mocha": true
     },
-    "extends": "eslint:recommended",
-    "ecmaFeatures": {
-        "experimentalObjectRestSpread": false
-    }
+    "extends": "eslint:recommended"
 }

test/extend.js

@@ -82,7 +82,7 @@ describe('Extend', () => {
                 </if>
             </extends>
         `, options).then(html => {
-            expect(html).toBe(cleanHtml(`content value foo equal bar`));
+            expect(html).toBe(cleanHtml('content value foo equal bar'));
         });
     });