Avoid returning ephemerides for yesterday or tomorrow

[Deuchnord]

Q	A
Bug fix?	yes
New feature?	no
Related issues	N/A
Has BC-break	no
License	GNU AGPL-v3

Checklist:

• I have updated the manpages

Fix the dates issue in the ephemerides

[codecov]

Codecov Report

Merging #99 into master will increase coverage by 0.18%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #99      +/-   ##
==========================================
+ Coverage   86.30%   86.49%   +0.18%     
==========================================
  Files           8        9       +1     
  Lines         584      570      -14     
  Branches       95       86       -9     
==========================================
- Hits          504      493      -11     
- Misses         61       64       +3     
+ Partials       19       13       -6     

Impacted Files	Coverage Δ
kosmorrolib/core.py	91.17% <ø> (ø)
kosmorrolib/dumper.py	78.77% <ø> (-0.72%)	⬇️
kosmorrolib/dateutil.py	100.00% <100.00%> (ø)
kosmorrolib/ephemerides.py	86.20% <100.00%> (+0.24%)	⬆️
kosmorrolib/events.py	100.00% <100.00%> (ø)

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