Add get_tournament() method to get information about a tournament

[dignissimus]

Resolves #30

[codecov-io]

Codecov Report

Merging #33 (c562146) into master (1b000a4) will decrease coverage by 0.16%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master      #33      +/-   ##
==========================================
- Coverage   70.04%   69.88%   -0.17%     
==========================================
  Files           8        8              
  Lines         671      674       +3     
==========================================
+ Hits          470      471       +1     
- Misses        201      203       +2     

Impacted Files	Coverage Δ
berserk/clients.py	33.69% <33.33%> (-0.01%)	⬇️

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