feat: added changelogs

docs/changelogs/1.8.0.md

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+# Blitzkrieg 1.8.0
+
+A slick new command and new potentials unlocked.
+
+## Changes
+
+- Added `/ping`
+  - Allows you to see if the bot and Blitz are alive
+- Added custom periods for `/stats`
+  - To do this, `/stats` received two sub command groups: `/stats player` and `/stats tank` (hence merging the two)
+  - All periods, including cusotm ones, now live as subcommands
+- Added tier weights to `/stats`
+- Added `/evolution`
+  - Shows your winrate and battles over a period
+
+## Fixes
+
+- `Infinity` and `NaN` values now show up as `--` in `/stats`
+- WN8 shortcomings in `/eligible` now rounds to nearest integer
+- Average tiers now, once again, show up in `/stats`
+
+## Technical Changes
+
+- Dev command names are implemented centrally in `interactionCreated`
+- Abstracted the renderers of `/stats`, `/evolution`, and `/today`
+- The bot now logs the number of server it's in on start up