Style: rename set_merge_cell to merge_cell

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.16% (target: -5.00%)	:white_check_mark: 85.71%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (f0474882c2373d81395d3408b48445d8925f1aaf) | 990 | 963 | 97.27% | | | Head commit (a70f825c14a6c8a14e9b42824c6640959361216e) | 1003 (+13) | 974 (+11) | 97.11% (**-0.16%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#74) | 14 | 12 | **85.71%** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 87.50000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 97.10%. Comparing base (f047488) to head (a70f825).

Files	Patch %	Lines
pyfastexcel/workbook.py	50.00%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #74 +/- ## ========================================== - Coverage 97.25% 97.10% -0.16% ========================================== Files 14 14 Lines 1057 1070 +13 ========================================== + Hits 1028 1039 +11 - Misses 20 22 +2 Partials 9 9 ```

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