Compute more accurate Moon phase

BREAKING CHANGE: JSON format now returns the moon phase as an object
instead of a string

Add codecov

fix(dumper): display the right date on output text

Bump tabulate from 0.8.5 to 0.8.6

Bumps [tabulate](https://github.com/astanin/python-tabulate) from 0.8.5 to 0.8.6.
- [Release notes](https://github.com/astanin/python-tabulate/releases)
- [Changelog](https://github.com/astanin/python-tabulate/blob/master/CHANGELOG)
- [Commits](https://github.com/astanin/python-tabulate/compare/v0.8.5...v0.8.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Bump skyfield from 1.14 to 1.15

Bumps [skyfield](https://github.com/brandon-rhodes/python-skyfield) from 1.14 to 1.15.
- [Release notes](https://github.com/brandon-rhodes/python-skyfield/releases)
- [Changelog](https://github.com/skyfielders/python-skyfield/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/brandon-rhodes/python-skyfield/compare/1.14...1.15)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build: add commitlint configuration

fix: set times are now correct

Add --clear-cache option

Add release workflow

Bump pylint from 2.4.3 to 2.4.4

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.4.3 to 2.4.4.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](https://github.com/PyCQA/pylint/compare/pylint-2.4.3...pylint-2.4.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Update PIP when a new version is tagged

Add JSON output

Bump numpy from 1.17.3 to 1.17.4

Bumps [numpy](https://github.com/numpy/numpy) from 1.17.3 to 1.17.4.
- [Release notes](https://github.com/numpy/numpy/releases)
- [Changelog](https://github.com/numpy/numpy/blob/master/doc/HOWTO_RELEASE.rst.txt)
- [Commits](https://github.com/numpy/numpy/compare/v1.17.3...v1.17.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>