Add --insecure flag to allow connections without validating SSL certificates

[Fitblip]

Fixes #5

[codecov-io]

Codecov Report

Merging #9 into master will increase coverage by 0.13%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   75.78%   75.92%   +0.13%     
==========================================
  Files           5        5              
  Lines         318      324       +6     
==========================================
+ Hits          241      246       +5     
- Misses         77       78       +1

Impacted Files	Coverage Δ
wsstat/__init__.py	100% <ø> (ø)	⬆️
wsstat/main.py	91.3% <100%> (+0.39%)	⬆️
wsstat/clients.py	70.65% <83.33%> (+0.26%)	⬆️

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[coveralls]

Coverage increased (+0.1%) to 75.926% when pulling d126b81 on fitblip/add-ssl-ignore into ee590f9 on master.

[coveralls]

Coverage increased (+0.1%) to 75.926% when pulling d126b81 on fitblip/add-ssl-ignore into ee590f9 on master.