updated changelog

CHANGELOG.txt

-WCM Base 7.x-1.5-rc3, 2018-02-22
+WCM Base 7.x-1.5-rc3, 2018-02-23
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 - WCM Base:
   - Updated Drupal to 7.57 per SA-CORE-2018-001.
   - Remove metatag and wcm_metatag dependencies until config is finalized.
-- WCM Omega: Moved main-content anchor to between breadcrumbs and messages.
+- WCM Omega:
+  - Moved main-content anchor to between breadcrumbs and messages.
+  - Added accessible focus indicators to links.
+  - Improved text color contrast for accessibility.
 - WCM Panels Settings:
   - Changes image pane field widget type to Media Browser.
   - Deletes duplicate link fields on image panes.