clean up making user agent optional

[zeke]

Followup to #26 which missed a few things.

[zeke]

$ npx np patch

		
Warning: No files field specified in package.json nor is a .npmignore file present. Having one of those will prevent you from accidentally publishing development-specific files along with your package's source code to npm.
		

Publish a new version of replicate (current: 0.6.0)

Commits:
- clean up making user agent optional (#28)  b54f0f2
- Don't require user agent  ef03afa

Commit Range:
v0.6.0...main

Registry:
https://registry.npmjs.org/


  ✔ Prerequisite check
  ✔ Git
  ✔ Installing dependencies using npm
  ✔ Running tests using npm
  ✔ Bumping version using npm
  ✔ Publishing package using npm
  ✔ Pushing tags
  ✔ Creating release draft on GitHub

https://github.com/replicate/replicate-javascript/releases/tag/v0.6.1