Use softer adjustment for start date for Copyright block.

[KineticTheory]

Status

• Reference:
  • Pre-Merge Code Review
  • CDash Status
• Checks
  • [ ] Travis/Appveyor CI checks pass
  • [ ] Code coverage does not decrease
  • [ ] Valgrind test passes
  • [ ] Toss3 checks pass
  • [ ] Trinitite checks pass
  • [ ] Code reviewed/approved, sufficient DbC checks, testing, documentation

[codecov[bot]]

Codecov Report

Merging #1107 (77610e1) into develop (b430098) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           develop   #1107   +/-   ##
=======================================
  Coverage     88.7%   88.7%           
=======================================
  Files          374     374           
  Lines        18593   18593           
=======================================
  Hits         16497   16497           
  Misses        2096    2096