Update pypolymlp feature

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 31.95266% with 115 lines in your changes missing coverage. Please review.

Project coverage is 64.50%. Comparing base (ce96f84) to head (20a4021). Report is 14 commits behind head on develop.

:exclamation: Current head 20a4021 differs from pull request most recent head 3d49320

Please upload reports for the commit 3d49320 to get more accurate results.

Files	Patch %	Lines
phono3py/api_phono3py.py	15.87%	53 Missing :warning:
phono3py/cui/create_force_constants.py	20.00%	32 Missing :warning:
phono3py/cui/load.py	60.71%	22 Missing :warning:
test/api/test_api_phono3py.py	20.00%	4 Missing :warning:
phono3py/cui/phono3py_argparse.py	0.00%	3 Missing :warning:
phono3py/cui/show_log.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #242 +/- ## =========================================== - Coverage 66.34% 64.50% -1.84% =========================================== Files 72 72 Lines 12638 12752 +114 =========================================== - Hits 8385 8226 -159 - Misses 4253 4526 +273 ```

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