Update README.md - make stable branch less shouty

[richbeales]

Background

"Use stable not master" is still valid advice, but it should be less shouty.

Changes

Documentation

Test Plan

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2023 10:14pm

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (627aeb2) 62.75% compared to head (3f7c6eb) 62.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3702   +/-   ##
=======================================
  Coverage   62.75%   62.75%           
=======================================
  Files          73       73           
  Lines        3367     3367           
  Branches      487      487           
=======================================
  Hits         2113     2113           
  Misses       1107     1107           
  Partials      147      147           

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[p-i-]

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