Fix image on top of README

Changelog for 0.16

Some plot_manuever improvements

Remove unused code in example.

Fix #1377 plot_maneuver with single impulse.

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Remove use of units in `poliastro.core`

Fix #1256

Mark test xfail for 32 bit systems.

Fix #1381, fix #1355 change_ecc_inc improvements.

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modified to admit no change in inclination (only semi-major axis)

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Fix #421 newton factory for specialized Newton method.

Accelerate `func_twobody`, fix #1380

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Remove codeclimate from README

Unhide post

Fix October updates slug

Using `to_value` instead of `to(...).value`

Add October updates

Co-authored-by: Yash-10 <[email protected]>

chore: [pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/psf/black: 21.9b0 → 21.10b0](https://github.com/psf/black/compare/21.9b0....

New plotting maneuver feature

Add core and safe versions of change_argp.

Fix #1360 vectorize rotation_matrix and fix axis=1

Fix izzo2015 initial guess

Add error messages to assert conditions

coe2rv: Fix argument name.

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Fix #1363 do not change plane in apply_maneuver

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Remove assert message

Remove

fix

Fix #1357 Implement spherical_to_cartesian

Fix #1355: Add core and safe versions of change_a_inc.

Use keyword arguments when invoking `from_classical`

Fix typo manuever -> maneuver

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Omitting invocation of `test_3rd_body_Curtis` in
`tests\tests_twobody\test_perturbations.py` bec...

Fix #1343: Rename change_inc_ecc to change_ecc_inc

Remove unused delta_inc

build: Use PEP 660 compatible flit to enable pip editable installs

Required to allow for support of PEP 660 which allows for flit to take
advantage of `python -m p...