Release 0.4.2

[oscarbenjamin]

• Remove old travis config
• Update README because of Linux wheels and conda package
• Bump version 0.4.1 -> 0.4.2
• Update repo URL (moved to flintlib org)
• Add CI job to build sdist along with wheels.

[isuruf]

Fix this as well?

[oscarbenjamin]

Oh, yeah. Thanks.

I think there have been a bunch of forks and things in different places.

[oscarbenjamin]

Okay, 0.4.2 is released. I've pushed the tag and the files are on PyPI:
https://pypi.org/project/python-flint/#files

I've just pip installed the wheel from PyPI on Linux and all tests are passing:

$ pip install python-flint
Collecting python-flint
  Downloading python_flint-0.4.2-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (32.4 MB)
     ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 32.4/32.4 MB 5.4 MB/s eta 0:00:00
Installing collected packages: python-flint
Successfully installed python-flint-0.4.2
$ python -m flint.test
Running tests...
test_pyflint...OK
test_fmpz...OK
test_fmpz_factor...OK
test_fmpz_functions...OK
test_fmpz_poly...OK
test_fmpz_poly_factor...OK
test_fmpz_poly_functions...OK
test_fmpz_mat...OK
test_fmpz_series...OK
test_fmpq...OK
test_fmpq_poly...OK
test_fmpq_mat...OK
test_fmpq_series...OK
test_nmod...OK
test_nmod_poly...OK
test_nmod_mat...OK
test_arb...OK
Running doctests...
flint.test: all 17 tests passed!
flint.test: all 1619 doctests passed!
----------------------------------------
OK: Your installation of python-flint seems to be working just fine!
----------------------------------------

Thanks again @isuruf !