Build using PyPi source tarball fails due to missing requirements.txt

[ptribble]

The 1.2.0 source tarball on PyPi appears to be incomplete, so that using it to build from source fails like so:

$ python3 setup.py build
Traceback (most recent call last):
File "setup.py", line 103, in
install_requires=get_requirements(),
File "setup.py", line 56, in get_requirements
with open(join(package_dir, 'requirements.txt')) as requirements:
FileNotFoundError: [Errno 2] No such file or directory: '/export/home/ptribble/ud/uk_covid19-1.2.0/requirements.txt'

[xenatisch]

It's just can't find the requirements files. Not sure why that's happening though as the path is dynamically generated.

The routine installation should still work though. I'll have a look.