bug v3: Remove branch dev in readme file

[minhtien3297]

Did you check docs and existing issues?

• [X] I have read all the trouble.nvim docs
• [X] I have searched the existing issues of trouble.nvim
• [X] I have searched the existing issues of plugins related to this issue

Neovim version (nvim -v)

0.1

Operating system/version

MacOS 14.5

Describe the bug

In the readme file in install guide, the dev branch still exists in main branch's readme file

Steps To Reproduce

Expected Behavior

Remove branch dev because it causes error when updating

[folke]

Good catch. Fixed!