Add the ability to get the browser from an env. variable #10
  Add this suggestion to a batch that can be applied as a single commit.
  This suggestion is invalid because no changes were made to the code.
  Suggestions cannot be applied while the pull request is closed.
  Suggestions cannot be applied while viewing a subset of changes.
  Only one suggestion per line can be applied in a batch.
  Add this suggestion to a batch that can be applied as a single commit.
  Applying suggestions on deleted lines is not supported.
  You must change the existing code in this line in order to create a valid suggestion.
  Outdated suggestions cannot be applied.
  This suggestion has been applied or marked resolved.
  Suggestions cannot be applied from pending reviews.
  Suggestions cannot be applied on multi-line comments.
  Suggestions cannot be applied while the pull request is queued to merge.
  Suggestion cannot be applied right now. Please check back later.
  
    
  
    
This is a proposal to have the ability to overwrite the default browser from the OS. If you like it, I'll also update the readme.
Let me know your thoughts.
Some context: On my setup I have to deal with multiple accounts for different applications, and therefore I'm using multiple browsers. One of my browsers (Firefox), I'm using to administer AWS, but I don't want to set this browser as default. Having the ability to set a "BROWSER" env. variable, allows me to use Firefox for the aws-sso-cli login process.