Add TLS support

[kezhuw]

Closes #14.

[codecov]

Codecov Report

Attention: Patch coverage is 87.60000% with 31 lines in your changes are missing coverage. Please review.

Project coverage is 83.89%. Comparing base (45db940) to head (b172923).

❗ Current head b172923 differs from pull request most recent head c52b2ad. Consider uploading reports for the commit c52b2ad to get more accurate results

Files	Patch %	Lines
src/session/connection.rs	85.52%	11 Missing ⚠️
src/client/mod.rs	86.95%	6 Missing ⚠️
src/session/depot.rs	58.33%	5 Missing ⚠️
src/error.rs	0.00%	4 Missing ⚠️
src/session/mod.rs	90.90%	3 Missing ⚠️
src/util.rs	95.65%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
+ Coverage   83.75%   83.89%   +0.13%     
==========================================
  Files          30       31       +1     
  Lines        3971     4166     +195     
==========================================
+ Hits         3326     3495     +169     
- Misses        645      671      +26     

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