feat: update changelog and gpt avatar generator improvements

Merged PR #895 with changelog updates and GPT avatar generator improvements

Author: hyacinthus

CHANGELOG.md

@@ -1,3 +1,16 @@
+## v0.8.19
+
+### Bug Fixes
+- **Credit System**: Updated credit system logic in core credit module
+- **Skill Author Handling**: Fixed skill author handling in credit calculations
+
+### Technical Details
+- Updated `intentkit/core/credit.py` with improved logic
+- All linting checks passed
+- No breaking changes
+
+**Full Changelog**: https://github.com/crestalnetwork/intentkit/compare/v0.8.18...v0.8.19
+
 ## v0.8.18
 
 ### Features

intentkit/skills/openai/gpt_avatar_generator.py

@@ -13,9 +13,9 @@
 logger = logging.getLogger(__name__)
 
 AVATAR_PROMPT_PREFIX = (
-    "Create a single, centered portrait that works perfectly as a profile avatar. "
-    "Use flattering, even lighting, a simple soft-focus background, and a composition from shoulders up. "
-    "Avoid text, logos, watermarks, and distracting elements so the result feels polished and personable."
+    "Create an image suitable for a profile picture, with a clean background but not pure white, "
+    "and a clear subject that is recognizable even at small sizes. If there are no style requirements "
+    "in the subsequent description, use anime style. The content is as follows:"
 )