Fix the bug in the updating strategy of term F in CRLI

[WenjieDu]

What does this PR do?

Fixing #225

Before submitting

• Was this discussed/approved via a GitHub issue? Please add a link to it if that's the case.
• I have commented my code, particularly in hard-to-understand areas.
• I have written necessary tests and already run them locally.

[coveralls]

Pull Request Test Coverage Report for Build 6761396859

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 6 of 6 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.009%) to 84.194%

---

Files with Coverage Reduction	New Missed Lines	%
pypots/clustering/crli/model.py	1	90.6%

Totals
Change from base Build 6703021294:	0.009%
Covered Lines:	4384
Relevant Lines:	5207

---

💛 - Coveralls