feat!: support 4.1.0, 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[bot]]

Codecov Report

Attention: Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 77.68%. Comparing base (a672599) to head (1019a42).

Files with missing lines	Patch %	Lines
transmission_rpc/types.py	81.81%	2 Missing :warning:
transmission_rpc/client.py	66.66%	1 Missing :warning:
transmission_rpc/torrent.py	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #399      +/-   ##
==========================================
+ Coverage   77.62%   77.68%   +0.05%     
==========================================
  Files          14       14              
  Lines        1506     1519      +13     
==========================================
+ Hits         1169     1180      +11     
- Misses        337      339       +2     

Flag	Coverage Δ
3.10	77.68% <77.77%> (+0.05%)	:arrow_up:
3.11	77.68% <77.77%> (+0.05%)	:arrow_up:
3.12	77.68% <77.77%> (+0.05%)	:arrow_up:
3.8	77.46% <76.47%> (+0.03%)	:arrow_up:
3.9	77.46% <76.47%> (+0.03%)	:arrow_up:

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