Update change log for new full screen video work

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Relatica Change Log
 
-## Unreleased Updates
+## Version 0.5.0 (beta), 27 April 2023
 
 * Changes
     * The "copy text" action now copies the plain text not HTML version. So things like hashtags
@@ -10,11 +10,14 @@
     * Contacts screen shows user's handle and last post time (as far as your server knows about) for the user
     * Links now open in the system browser on iOS and Android like on the desktop rather than within the app as an
       embedded browser
+    * Media Viewer Screen carousel function has been replaced with before/after arrows on the right/left edges in order
+      to make the zooming in of images more predictable.
 * Fixes
     * Seemingly disappearing contacts on Contacts screen have been corrected.
 * New Features
     * Responsive design for allowing the image and video attachments to scale up for larger videos
       but limit timeline/list width on very large screens.
+    * Videos are now viewable in the "Media Viewer Screen" (formerly "Image Viewer Screen")
     * Groups (Mastodon Lists) management including:
         * Creating new groups
         * Renaming groups