chore: bump version 1.8.1 -> 1.9.0

Author: aschung01

setup.py

@@ -10,7 +10,7 @@
 
 setup(
     name="weavel",
-    version="1.8.1",
+    version="1.9.0",
     packages=find_namespace_packages(),
     entry_points={},
     description="Weavel, Prompt Optimization and Evaluation for LLM Applications",