Update history to reflect merge of #765 [ci skip]

Author: jekyllbot

History.markdown

@@ -39,6 +39,7 @@
   * Add `x` social icon (#756)
   * Add Codeberg icon and update list of supported social links (#788)
   * Added whatsapp social icon. (#781)
+  * Update GitLab icon (#765)
 
 ### Major Enhancements