Add a changeset to consistenly bump minor versions for all packages (#372)

Author: seratch

.changeset/pink-moles-travel.md

@@ -0,0 +1,15 @@
+---
+'@openai/agents': minor
+'@openai/agents-core': minor
+'@openai/agents-extensions': minor
+'@openai/agents-openai': minor
+'@openai/agents-realtime': minor
+---
+
+Bump to v0.1 with the following chnages:
+
+- gpt-5 model support
+- opt-in: gpt-5 as default option
+- ai-sdk model provider v2 migration
+
+and more