Add a MANIFEST.in file

[barentsen]

Hi @keatonb :wave: Awesome you started building a Period04 alternative!! :clap:

Unfortunately it looks like pip install pyriod does not work right now because the requirements.txt file (used inside setup.py) is not included in the tarball that was sent to pypi:

$ pip install pyriod
Collecting pyriod
  Using cached https://files.pythonhosted.org/packages/62/00/0d13eedbf923b02e074de2b3946ea1ac488324eb51fa8806a066660e141c/Pyriod-0.0.1.tar.gz
    ERROR: Complete output from command python setup.py egg_info:
    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-646uifb8/pyriod/setup.py", line 6, in <module>
        with open("requirements.txt", "r") as fh:
    FileNotFoundError: [Errno 2] No such file or directory: 'requirements.txt'
    ----------------------------------------
ERROR: Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-646uifb8/pyriod/

The typical solution for this is to add a MANIFEST.in file to your repository, which tells setup.py which extra files need to be included in the source distribution tarball. This PR adds such a file!

If you merge this PR, you can check that the issue is resolved as follows:

$ python setup.py sdist
$ tar -tvf dist/Pyriod-0.0.1.tar.gz | grep requirements.txt
-rw-r--r-- gb/gb            64 2019-07-19 09:38 Pyriod-0.0.1/requirements.txt

Success! You can now upload this new tarball to pypi and the pip install should work! (However note that pypi will require you to increase the version number.)

Let me know if you have any questions!

[barentsen]

(PS: Packaging things in Python is still a dark art, it took me a million tries before I remembered all the steps.)

[keatonb]

Thanks @barentsen!! It's a lot to learn!