fix(readme): do not add patch version if it wasn't present

[sheerlox]

Description

The current implementation of the readme updater adds the patch version where it wasn't present.

Given the ~> operator's behavior is dependent on whether the patch is present or not, adding the patch version changes the meaning of the version requirement where the ~> operator is used.

Expected Behavior

~> MAJOR.MINOR should be updated to ~> MAJOR.MINOR

Actual Behavior

~> MAJOR.MINOR is updated to ~> MAJOR.MINOR.PATCH

Possible Fix

No response

Steps to Reproduce

Run semantic-release-hex on a repository with a ~> MAJOR.MINOR version requirement in the README.

Context

Related:

• Update version in README #20

Your Environment

• semantic-release-hex version: v1.1.0
• NodeJS version: N/A
• Operating System and version: N/A
• TypeScript version (if applicable): N/A
• Link to your project (if applicable): N/A