CreateCurlOptions method regression tests

[misantron]

Resolves issue #94

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description:

• Add tests for Client->createCurlOptions() method to prevent regressions in future.
• Some code-style/doc-block/etc fixes

[codecov]

Codecov Report

Merging #95 into master will increase coverage by 4.04%.
The diff coverage is 65.62%.

@@            Coverage Diff            @@
##           master     #95      +/-   ##
=========================================
+ Coverage   80.66%   84.7%   +4.04%     
=========================================
  Files           3       3              
  Lines         181     170      -11     
=========================================
- Hits          146     144       -2     
+ Misses         35      26       -9

Impacted Files	Coverage Δ
lib/Response.php	100% <100%> (+3.57%)	⬆️
lib/Client.php	81.56% <63.33%> (+4.53%)	⬆️

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[thinkingserious]

Hi @misantron,

I found another regression that I've just fixed. Could you please fix the new conflict? Thanks!

[misantron]

@thinkingserious Done

[thinkingserious]

Thanks @misantron!

This is looking good, I've added this to our backlog for review.

With Best Regards,

Elmer

[thinkingserious]

Hello @misantron,

Thanks again for the PR!

We appreciate your contribution and look forward to continued collaboration. Thanks!

Team SendGrid DX