feat!: support rpc version 18

[trim21]

feature:

• add sequential_download to client.change_torrent()
• add sequential_download to client.get_torrent()
• add ip_protocol argument to client.port_test()
• support file.beginPiece and file.endPiece

BREAKING CHANGE：client.port_test() now return a PortTestResult instead of a bool.

[codecov]

Codecov Report

Attention: Patch coverage is 86.66667% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 77.63%. Comparing base (b6337ac) to head (bc1ee30).

Files	Patch %	Lines
transmission_rpc/types.py	90.90%	2 Missing ⚠️
transmission_rpc/client.py	75.00%	1 Missing ⚠️
transmission_rpc/torrent.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
+ Coverage   77.49%   77.63%   +0.13%     
==========================================
  Files          14       14              
  Lines        1471     1489      +18     
==========================================
+ Hits         1140     1156      +16     
- Misses        331      333       +2     

Flag	Coverage Δ
3.10	77.63% <86.66%> (+0.13%)	⬆️
3.11	77.63% <86.66%> (+0.13%)	⬆️
3.12	77.63% <86.66%> (+0.13%)	⬆️
3.8	77.51% <82.60%> (+0.03%)	⬆️
3.9	77.51% <82.60%> (+0.03%)	⬆️

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