feat: added changelogs

docs/changelogs/1.5.0.md

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+# Blitzkrieg 1.5.0
+
+So so many **quality-of-life** changes and nasty **bug squashes**!
+
+## Changes
+
+- Added WN8 to `/today`, `/stats`, and `/tankstats`
+- Added average tier to `/stats` and `/tankstats`
+  - Average tier in `/tankstats` is simply the tier of the tank that you are looking up
+- Added an indicator of WN8 ranging from "very bad" (gray) to "super unicum" (purple)
+- Replaced ellipses with simple clipping
+- Added a "large image" warning to `/today` if displaying `6` or more tanks
+
+## Fixes
+
+- Removed random 0 that'd show up in `/today` where there was no difference between career and today's stats
+- Added stricter checks for username autocomplete via a new REGEX pattern
+- Fixed wonky ellipses that'd cut off usernames, tank names, and clan names unnecessarily
+- Fixed the delta indicator showing up in battle counts
+
+## Technical Changes
+
+- Optimized and cleaned up tankopedia cache