changelog formtatting changes

CHANGELOG.txt

 WCM Base 7.x-1.4-rc3, 2018-01-xx
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 - WCM Omega:
- -  Styled featured image field captions the same as WYSIWYG media captions.
- -  Removed superfluous accordion margins.
+  - Styled featured image field captions the same as WYSIWYG media captions.
+  - Removed superfluous accordion margins.
 - WCM Panels Settings: Updated accordion filter pane to search views accordions.
 - OCIO FAQs: Removed FAQ pane pager.
 - OCIO Media: Display caption file field on node edit form image fields.