add pandas missing dependency to setup.py

[juanesarango]

Problem

Pandas==1.0.3 dependency is missing in setup.py, causing it to fail when installing it with pip.

ALLSorts/setup.py

Lines 16 to 23 in be43d6c

	install_requires=[
	"joblib==0.15.1",
	"matplotlib==3.2.1",
	"scikit-learn==0.22.1",
	"umap-learn==0.4.4",
	"plotly==4.14.3",
	"kaleido==0.1.0"
	],

Notice pandas is correctly defined in the conda environment file:

ALLSorts/env/allsorts.yml

Lines 7 to 19 in be43d6c

	dependencies:
	- joblib=0.15.1
	- matplotlib=3.2.1
	- numpy=1.18.1
	- pandas=1.0.3
	- pip=20.0.2
	- python=3.8.3
	- scikit-learn=0.22.1
	- scipy=1.4.1
	- setuptools=46.4.0
	- umap-learn=0.4.4
	- plotly==4.14.3
	- numba==0.52.0

Replicate error

$ pip install git+https://github.com/Oshlack/ALLSorts@be43d6c#egg=ALLSorts
$ ALLSorts --help
Traceback (most recent call last):
  File "/tmp/allsorts_virtualenv/bin/ALLSorts", line 5, in <module>
    from ALLSorts.allsorts import run
  File "/tmp/allsorts_virtualenv/lib/python3.6/site-packages/ALLSorts/allsorts.py", line 27, in <module>
    import pandas as pd
ModuleNotFoundError: No module named 'pandas'