Fixes for dependency (scipy and pandas) updates

[adamnarai]

Fixed the bug from #232

To pass unit tests I also:
Implemented your fix @raphaelvallat from #227

DataFrame.apply() does not copy dtypes for some reason ant it is also deprecated (https://pandas.pydata.org/pandas-docs/version/1.4.0/whatsnew/v1.4.0.html), causing unit tests to fail, so I replaced the following line

pingouin/pingouin/pairwise.py

Lines 461 to 462 in dcfdc82

	stats = stats.append(
	pd.DataFrame(columns=stats.columns, index=idxiter), ignore_index=True)

with

stats = stats.reindex(stats.index.union(idxiter))

[codecov]

Codecov Report

Merging #234 (0b3c5d1) into master (dcfdc82) will decrease coverage by 0.11%.
The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master     #234      +/-   ##
==========================================
- Coverage   98.93%   98.81%   -0.12%     
==========================================
  Files          19       19              
  Lines        3282     3290       +8     
  Branches      529      529              
==========================================
+ Hits         3247     3251       +4     
- Misses         18       22       +4     
  Partials       17       17              

Impacted Files	Coverage Δ
pingouin/parametric.py	99.14% <60.00%> (-0.43%)	⬇️
pingouin/plotting.py	95.94% <60.00%> (-0.54%)	⬇️
pingouin/correlation.py	98.71% <100.00%> (ø)
pingouin/pairwise.py	99.39% <100.00%> (+<0.01%)	⬆️

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[raphaelvallat]

Hi @adamnarai,

Thank you, this is great! I haven't checked but I am guessing that we should also remove the call to from_records() in correlation.py:

pingouin/pingouin/correlation.py

Lines 647 to 648 in 72e447d

	# Convert to DataFrame
	stats = pd.DataFrame.from_records(stats, index=[method])

and

pingouin/pingouin/correlation.py

Lines 865 to 866 in 72e447d

	# Convert to DataFrame
	stats = pd.DataFrame.from_records(stats, index=[method])

[adamnarai]

You're right, it's better to remove it from here too (I think it wasn't used elsewhere), I added a commit.
It only worked here because "columns" wasn't specified.

[raphaelvallat]

Good to merge!

[raphaelvallat]

Merging now, thanks!