chore(core): update changelog

CHANGELOG.md

@@ -28,11 +28,12 @@
 * **core:** Markdown parsing should be cached in production #287
 * **core:** YAML parsing will be cached in production #263
 * **core:** add routable option for entries #284  
-usage:
-```
-routable: false
-```
-by default `routable` is `true`
+
+    usage:
+    ```
+    routable: false
+    ```
+    by default `routable` is `true`
 
 * **admin-plugin:** add help text for common form controls #280
 * **admin-plugin:** add icons for settings tabs sections #293