Update license header

[codecov[bot]]

Codecov Report

Merging #369 (5b72e14) into master (70b9118) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #369   +/-   ##
=======================================
  Coverage   68.81%   68.82%           
=======================================
  Files         172      172           
  Lines       13486    13487    +1     
=======================================
+ Hits         9281     9282    +1     
  Misses       4205     4205           

Impacted Files	Coverage Δ
src/analyticfunctions/HarmonicOscillatorFunction.h	100.00% <ø> (ø)
src/analyticfunctions/HydrogenFunction.cpp	61.34% <ø> (ø)
src/analyticfunctions/HydrogenFunction.h	66.66% <ø> (ø)
src/analyticfunctions/NuclearFunction.cpp	100.00% <ø> (ø)
src/analyticfunctions/NuclearFunction.h	100.00% <ø> (ø)
src/analyticfunctions/NuclearGradientFunction.cpp	97.36% <ø> (ø)
src/analyticfunctions/NuclearGradientFunction.h	100.00% <ø> (ø)
src/chemistry/Element.h	100.00% <ø> (ø)
src/chemistry/Molecule.cpp	66.91% <ø> (ø)
src/chemistry/Molecule.h	86.20% <ø> (ø)
... and 162 more

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