feat: added changelogs

docs/changelogs/1.3.0.md

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+# Blitzkrieg 1.3.0
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+This release of Blitzkrieg focuses mainly on **performance**. Blitzkrieg now uses **Satori** and **resvg** under the hood to render images resulting in a solid **2x to 8x performance boost** depending on the situation.
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+This only applies to `/today` and /stats` as they're the only commands that render an image currently.
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+We're working further on **performance optimizations**. Our goal is to deliver a message within **3 seconds or less**. We're close and we'll get there!
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+**Thank you to ba·ka**, the creator of aftermath, for telling me about Satori!