Add configuration for authorship and copyright.

[bartfeenstra]

No description provided.

[codecov]

Codecov Report

Merging #279 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #279      +/-   ##
==========================================
+ Coverage   97.09%   97.11%   +0.01%     
==========================================
  Files          21       21              
  Lines        1689     1698       +9     
==========================================
+ Hits         1640     1649       +9     
  Misses         49       49

Impacted Files	Coverage Δ
betty/config.py	98.9% <100%> (+0.05%)	⬆️

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