doc: Update license year range to 2020 #17801

1. 
   emilengler commented at 7:55 pm on December 26, 2019: contributor

   See #15061 The same procedure as every year. Happy new year to all of you :)
2. fanquake added the label Docs on Dec 26, 2019
3. 
   fanquake commented at 8:25 pm on December 26, 2019: member

   Please don’t use trivial: in commit messages / PRs. It was removed from CONTRIBUTING.md because it’s not useful as a commit category.
4. doc: Update license year range to 2020 8dc9aa90c3
5. emilengler renamed this:
   trivial: Update license year range to 2020
   doc: Update license year range to 2020
   on Dec 26, 2019
6. emilengler force-pushed on Dec 26, 2019
7. MarcoFalke referenced this in commit b931f61b9a on Dec 28, 2019
8. MarcoFalke merged this on Dec 28, 2019
9. MarcoFalke closed this on Dec 28, 2019

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10. sidhujag referenced this in commit 7787d8697d on Jan 2, 2020
11. sidhujag referenced this in commit 1fbdba696e on Nov 10, 2020
12. MarcoFalke referenced this in commit e75f91eae3 on Dec 31, 2020
13. MarcoFalke referenced this in commit bcf2b25eec on Jan 3, 2022
14. DrahtBot locked this on Aug 16, 2022

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