Add Connector to deprecate ClientBuilder

[kezhuw]

Closes #28.

[codecov]

Codecov Report

Attention: Patch coverage is 65.21739% with 48 lines in your changes are missing coverage. Please review.

Project coverage is 85.13%. Comparing base (a946882) to head (175b0d8).

Files	Patch %	Lines
src/client/mod.rs	54.71%	48 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
+ Coverage   84.38%   85.13%   +0.75%     
==========================================
  Files          31       31              
  Lines        4297     4346      +49     
==========================================
+ Hits         3626     3700      +74     
+ Misses        671      646      -25     

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