Update PyPiDescription.rst

[bryanwweber]

Fix the link to the README on PyPI. Use python -m pip for installation.

Checklist:

• Did you have fun?

[agunapal]

@msaroufim If the current URL is incorrect, any idea how its working?

[codecov]

Codecov Report

Merging #2445 (bb895b6) into master (5390025) will not change coverage.
The diff coverage is n/a.

❗ Current head bb895b6 differs from pull request most recent head 8e9d78e. Consider uploading reports for the commit 8e9d78e to get more accurate results

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  Misses       1023     1023           
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Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)

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[bryanwweber]

I'm sorry, I didn't provide any context for these changes! My mistake, I submitted the PR and then forgot about it.

I was browsing PyPI and noticed that the content formatting is not correct:

I believe at some point, PyPI defaulted to assuming that the long_description is Markdown formatted, so the setup.py changes fix the text format type so that the README will be displayed properly. In addition, the url link is missing the blob/master portion, so it returns 404 from GitHub. This only affects the URL displayed in the PyPI user interface, it it is correct for the root-level setup.py. Finally, the same problem occurs in the PypiDescription.rst as far as the link is concerned.

Thanks for reviewing!