Issues with sdist of the uni2ts package

[liu-jc]

Describe the bug
Something wrong with our sdist file. But wheel is fine. Not sure why. Currently, users can successfully do pip install. Just mark down here if we face any issues later.

To Reproduce
Please provide a code snippet of a minimal reproducible example for the error.

wget https://files.pythonhosted.org/packages/27/40/f646eb585189b38c8a2c3728543e8aceed8331869d9374146d73b321bea7/uni2ts-1.1.1.tar.gz

pip install uni2ts-1.1.1.tar.gz

python -c "import uni2ts"

Expected behavior
It should have no error as using wheel.
For example, if we use the following code:

wget https://files.pythonhosted.org/packages/cb/5a/ad377f753685090eaa43cd10a9e31bbc717843973bd953dc9dbe7f4b759a/uni2ts-1.1.1-py3-none-any.whl

pip install uni2ts-1.1.1-py3-none-any.whl

python -c "import uni2ts"

No error will come out.
Error message or code output
Paste the complete error message, including stack trace, or the undesired output that the above snippet produces.

>>> import uni2ts
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'uni2ts'