Support for qBittorrent 4.3.4.1

[rmartin16]

• Add support for ratio limit and seeding time limit when adding torrents in qBittorrent 4.3.4.1
• Since the qBittorrent Web API is experiencing breaking changes to API signatures, this client will now attempt to manage upgrading and downgrading API signatures automatically. (See Please Prioritize Web API Signature Compatibility Within Major Versions qbittorrent/qBittorrent#14755 for more info)
• So, you can use the old or the new signature and it'll do its best to convert based on the running qBittorrent.

[codecov]

Codecov Report

Merging #51 (679e130) into master (8267d4a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #51   +/-   ##
=======================================
  Coverage   99.66%   99.66%           
=======================================
  Files          14       14           
  Lines        1775     1790   +15     
  Branches      112      117    +5     
=======================================
+ Hits         1769     1784   +15     
  Partials        6        6           

Impacted Files	Coverage Δ
qbittorrentapi/torrents.py	100.00% <100.00%> (ø)

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