put shared folder name as group in the account

[fushall]

Though I have not an account with shared folder.

[codecov]

Codecov Report

Merging #43 (b204292) into master (41af73a) will decrease coverage by 0.41%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   72.72%   72.30%   -0.42%     
==========================================
  Files          10       10              
  Lines         385      390       +5     
==========================================
+ Hits          280      282       +2     
- Misses        105      108       +3     

Impacted Files	Coverage Δ
lastpass/vault.py	71.73% <33.33%> (-3.88%)	⬇️

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