Fix #12, union operator

[thinkingserious]

Fixes #12

[thinkingserious]

Hello @thinkingserious,

Thanks again for the PR!

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

Team SendGrid DX

[codecov]

Codecov Report

Merging #91 into master will decrease coverage by 1.51%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
- Coverage   80.87%   79.35%   -1.52%     
==========================================
  Files           3        3              
  Lines         183      218      +35     
==========================================
+ Hits          148      173      +25     
- Misses         35       45      +10

Impacted Files	Coverage Δ
lib/Client.php	76.21% <100%> (-1.12%)	⬇️

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