build: bump version to 0.19.0

Author: Soheyl

setup.py

@@ -7,7 +7,7 @@
 
 setup(
     name="assemblyai",
-    version="0.18.0",
+    version="0.19.0",
     description="AssemblyAI Python SDK",
     author="AssemblyAI",
     author_email="engineering.sdk@assemblyai.com",