feat: changelogs

docs/changelogs/1.15.4.md

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+# Blitzkrieg 1.15.4
+
+Unlocking future potential
+
+## Technical Changes
+
+- Moved the word "Ratings" to the front of the workflow name
+- Renamed `blitzkrieg-db` to `blitzkrieg-assets`
+- Moved the region folders from the root to `regions`
+
+## Technical Fixes
+
+- The ratings leaderboard archiver now correctly skips undefined players