test: Fix rubocop.yml formatting warnings

[RolandBurrows]

Short description of what this PR does:

Previous rubocop output:

ruby-http-client$ rubocop
.rubocop.yml: Style/EmptyLinesAroundBlockBody has the wrong namespace - should be Layout
.rubocop.yml: Style/FileName has the wrong namespace - should be Naming
.rubocop.yml: Style/ExtraSpacing has the wrong namespace - should be Layout
Inspecting 7 files
.......
7 files inspected, no offenses detected

After this PR's changes:

ruby-http-client$ rubocop
Inspecting 7 files
.......
7 files inspected, no offenses detected

This change required re-alphabetizing the rubocop.yml entries list, and there were pre-existing mis-ordered entries that are now properly alphabetized as well.

Checklist

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

[SendGridDX]

All committers have signed the CLA.

[codecov[bot]]

Codecov Report

Merging #98 into master will increase coverage by 1.31%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #98      +/-   ##
==========================================
+ Coverage   94.14%   95.45%   +1.31%     
==========================================
  Files           2        2              
  Lines         239      286      +47     
==========================================
+ Hits          225      273      +48     
+ Misses         14       13       -1

Impacted Files	Coverage Δ
test/test_ruby_http_client.rb	97.43% <100%> (+0.66%)	:arrow_up:
lib/ruby_http_client.rb	91.2% <100%> (+1.92%)	:arrow_up:

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[thinkingserious]

Hello @RolandBurrows,

Thanks again for the PR!

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

Team SendGrid DX