feat(client)!: add_torrent support pathlib.Path

[trim21]

BREAKING CHANGE:

• Client().add_torrent: base64 encoded str as torrent is ambiguous and deprecated, will be removed in v4

[codecov]

Codecov Report

Merging #112 (c3c58e3) into master (641cabb) will increase coverage by 0.16%.
The diff coverage is 100.00%.

❗ Current head c3c58e3 differs from pull request most recent head 63e5092. Consider uploading reports for the commit 63e5092 to get more accurate results

@@            Coverage Diff             @@
##           master     #112      +/-   ##
==========================================
+ Coverage   73.50%   73.66%   +0.16%     
==========================================
  Files          14       14              
  Lines        1287     1295       +8     
==========================================
+ Hits          946      954       +8     
  Misses        341      341              

Flag	Coverage Δ
3.6	73.46% <100.00%> (+0.16%)	⬆️
3.7	73.46% <100.00%> (+0.16%)	⬆️
3.8	73.64% <100.00%> (+0.16%)	⬆️
3.9	73.64% <100.00%> (+0.16%)	⬆️
pypy3	73.46% <100.00%> (+0.16%)	⬆️

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Impacted Files	Coverage Δ
transmission_rpc/client.py	64.05% <ø> (ø)
tests/test_client.py	97.46% <100.00%> (+0.06%)	⬆️
transmission_rpc/utils.py	66.95% <100.00%> (+1.19%)	⬆️

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