added NetworkError reason and status code

[arossert]

Adding more information on network errors

[codecov]

Codecov Report

Merging #35 into master will decrease coverage by 17.16%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #35       +/-   ##
==========================================
- Coverage   89.86%   72.7%   -17.17%     
==========================================
  Files           9       9               
  Lines         306     381       +75     
==========================================
+ Hits          275     277        +2     
- Misses         31     104       +73

Impacted Files	Coverage Δ
lastpass/fetcher.py	60.83% <100%> (-35.22%)	⬇️
lastpass/parser.py	72.02% <0%> (-15.03%)	⬇️
lastpass/vault.py	75.6% <0%> (+1.25%)	⬆️

---

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@5063911). Learn more about missing BASE report.
⚠️ Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #35   +/-   ##
=========================================
  Coverage          ?   72.70%           
=========================================
  Files             ?        9           
  Lines             ?      381           
  Branches          ?        0           
=========================================
  Hits              ?      277           
  Misses            ?      104           
  Partials          ?        0           

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