v7.1.0

Added

• Add new Vector Store endpoints - thanks to @willywg for this PR!
• Add parameters to batches.list endpoint so you can for example use after - thanks to @marckohlbrugge!
• Add vision as permitted purpose for files - thanks again to @willywg for the PR.
• Add improved README example of tool calling - thanks @krschacht - check out his project HostedGPT!

Fixed

• Fix broken link in README table of contents - thanks to @garrettgsb!
• Skip sending nil headers - thanks to @drnic!