chore: update readme (#72)

Author: stainless-app[bot]

README.md

@@ -10,10 +10,10 @@ The underlying REST API documentation can be found on [platform.openai.com](http
 
 ## Installation
 
-To use this gem during the beta, install directly from GitHub with Bundler by adding the following to your application's `Gemfile`:
+To use this gem, install via Bundler by adding the following to your application's `Gemfile`:
 
 ```ruby
-gem "openai", git: "https://github.com/openai/openai-ruby", branch: "main"
+gem "openai", "~> 0.1.0.pre.alpha.2"
 ```
 
 To fetch an initial copy of the gem:
@@ -22,12 +22,6 @@ To fetch an initial copy of the gem:
 bundle install
 ```
 
-To update the version used by your application when updates are pushed to GitHub:
-
-```sh
-bundle update openai
-```
-
 ## Usage
 
 ```ruby