Add project region support

[childish-sambino]

Fixes

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

Contributing to Twilio

All third party contributors acknowledge that any contributions they provide will be made under the same open source license that the open source project is provided under.

Short description of what this PR does:

• Adds a region flag to the project topic

If you have questions, please file a support ticket, or create a Github Issue in this repository.

[codecov]

Codecov Report

Merging #14 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #14      +/-   ##
==========================================
+ Coverage      97%   97.01%   +0.01%     
==========================================
  Files          20       20              
  Lines         500      503       +3     
==========================================
+ Hits          485      488       +3     
  Misses         15       15

Impacted Files	Coverage Δ
src/commands/project/list.js	100% <100%> (ø)	⬆️
src/commands/project/add.js	90.12% <100%> (+0.12%)	⬆️

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[dprothero]

Nice touch