feat: enable endpoint version selection

[funder7]

Fixes

This update allows the selection of and endpoint version, needed in cases like Segmenting contacts V2 -> Update segment

As you can see, the example code snippet in the doc, uses a syntax that is not compatible with php (calling the endpoint is in fact not possible):

  $response = $sg->client->marketing()->segments()->2.0()->_($segment_id)->patch();
                                                 // ^^^^ wrong syntax

  # working example
  $response = $sg->client->marketing()->segments()->_version('2.0')->_($segment_id)->patch();
                                                 // ^^^^^^^^^^^^^^ 

Contents

• utility method to set version in the URL
• unit test of the new functionality
• improved readability with null coalescing operator

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket.

[funder7]

@twilio-dx any news about this PR? Thanks

[tiwarishubham635]

Hi @funder7! We have added this to our list and we'll be prioritising it soon. Thanks!

[funder7]

Hi, do you think that this and the other PR #159 will be merged at some point? :-)