add improved e notation

[dbatten5]

closes #15

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.31%.

Quality metrics	Before	After	Change
Complexity	21.02 😞	20.90 😞	-0.12 👍
Method Length	152.50 😞	154.17 😞	1.67 👎
Working memory	11.92 😞	11.87 😞	-0.05 👍
Quality	37.50% 😞	37.81% 😞	0.31% 👍

Other metrics	Before	After	Change
Lines	385	387	2

Changed files	Quality Before	Quality After	Quality Change
array_to_latex/__init__.py	37.50% 😞	37.81% 😞	0.31% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
array_to_latex/__init__.py	_dataframetolatex	31 😞	354 ⛔	13 😞	22.25% ⛔	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
array_to_latex/__init__.py	_numpyarraytolatex	23 😞	327 ⛔	13 😞	27.29% 😞	Refactor to reduce nesting. Try splitting into smaller methods. Extract out complex expressions
array_to_latex/__init__.py	to_ltx	8 ⭐	116 🙂	14 😞	52.42% 🙂	Extract out complex expressions

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[josephcslater]

Release 0.91 is out. Thank you!