chore(deps): bump skyfield from 1.31 to 1.33

[dependabot]

Bumps skyfield from 1.31 to 1.33.

Changelog

Sourced from skyfield's changelog.

v1.33 — 2020 November 18

• Fix: running load.timescale(builtin=False) was raising an exception FileNotFoundError if the finals2000A.all file was not already on disk, instead of downloading the file automatically. [#477](https://github.com/brandon-rhodes/python-skyfield/issues/477) <https://github.com/skyfielders/python-skyfield/issues/477>_

v1.32 — 2020 November 16

• A new :func:~skyfield.eclipselib.lunar_eclipses() routine finds lunar eclipses and determines their degree of totality. [#445](https://github.com/brandon-rhodes/python-skyfield/issues/445) <https://github.com/skyfielders/python-skyfield/issues/445>_

• The almanac module’s new :func:~skyfield.almanac.meridian_transits() routine can find the moments at which a body transits the meridian and antimeridian. [#460](https://github.com/brandon-rhodes/python-skyfield/issues/460) <https://github.com/skyfielders/python-skyfield/issues/460>_

• Fix: the :func:~skyfield.searchlib.find_minima() function was ignoring its epsilon and num arguments and always using the default values instead. [#475](https://github.com/brandon-rhodes/python-skyfield/issues/475) <https://github.com/skyfielders/python-skyfield/pull/475>_

• Fix: the .epoch attribute of Earth satellite objects that were built using :meth:~skyfield.sgp4lib.EarthSatellite.from_satrec() was, alas, a half-day off. [#466](https://github.com/brandon-rhodes/python-skyfield/issues/466) <https://github.com/skyfielders/python-skyfield/issues/466>_

• Fix: the :class:~skyfield.toposlib.Topos constructor arguments x and y, which never worked properly, have been deprecated and are now ignored.

Commits

• 82f8552 Fix #477 by using URL, not filename, for time file
• 953664f Small tweaks and fixes to documentation
• 2aad4f2 Update docs and declare 1.32
• 439c967 Remove polar motion scratch file
• f703e89 Avoid recomputing longitude rotation every time
• e8906b8 Fix polar motion when Time is an array
• b26f37d Discard Topos x,y parameters in favor of x,y table
• 2974446 Upgrade IERS import routine to also import x and y
• 8aed5e6 Avoid forcing array creation when Time is indexed
• c50fa16 Remove two TODO items
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 78.42% when pulling 35d07ae on dependabot/pip/master/skyfield-1.33 into 19e030f on features.