Remove usage of PHP alias in the Python client

[rzats]

Secondary PR to cmu-delphi/delphi-epidata#1288 that should be merged & deployed alongside it - fixed the delphi-epidata version to the newest client.

[capnrefsmmat]

Since the Epidata cient API is changing, we'll need to update the version number required in setup.py along with these changes, so users are guaranteed to have the updated version of the client.

[rzats]

@capnrefsmmat good point! I bumped the version once and will change it again if the release ends up being e.g. 4.1.3.

[melange396]

This looks good, aside from the pending versioning discussion and any resulting version number changes. I would wait to merge til then.

[melange396]

Did you get a chance to run tests for this with the updated client from cmu-delphi/delphi-epidata#1288 ? I think you might need to update the .return_values for the @patched async_epidata():

covidcast/Python-packages/covidcast-py/tests/test_covidcast.py

Lines 261 to 263 in 474dc20

	@patch("delphi_epidata.Epidata.async_epidata")
	def test__async_fetch_epidata(mock_async_epidata):
	mock_async_epidata.return_value = [({"message": "failed"}, {"time_values": 20200402})]

[melange396]

can we update the changelog, and then follow this set of instructions to update the version number for the package and rebuild docs and other artifacts? then we will be prepped to upload to PyPI when everything else is done.

[melange396]

@dshemetov makes a good point in cmu-delphi/delphi-epidata#1288 (comment) ... we should probably put documentation and show warning messages for deprecating _async_fetch_epidata(), just in case anyone is using it.

[melange396]

Suggested change

	- Remove usage of PHP alias in the Python client.
	- Use Python package-specific "user agent" string.
	- Mark :py:func:`_async_fetch_epidata` as deprecated.
	- New feature: Web requests now identify themselves with a `covidcast`-specific "user agent" string.
	- Update: Now uses newer version of the `delphi-epidata` libarary.
	- Bug fix: Removed usage of PHP alias endpoint for compatibility with new `delphi-epidata` version.
	- Deprecated function: Private method :py:func:`_async_fetch_epidata` has been deprecated.

[melange396]

@rzats this is failing at the linter now, i guess you didnt go through that part of the tests?

[melange396]

linting/pydocstyle is happy now, but now python tests are failing... @rzats can you take a look?

[rzats]

@melange396 latest round of tests is passing!