Update LICENSE file with the year of last update

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Build succeeded (check pipeline).

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Codecov Report

Merging #133 (20a5d61) into master (e29c7e4) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #133   +/-   ##
=========================================
  Coverage     72.22%   72.22%           
  Complexity       42       42           
=========================================
  Files             7        7           
  Lines           198      198           
  Branches         22       22           
=========================================
  Hits            143      143           
  Misses           47       47           
  Partials          8        8           

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Build succeeded (gate pipeline).

• https://checklist.intgdc.com/job/compliance/job/gooddata-http-client-merge-compliance-check/47/ : SUCCESS in 22s
• https://checklist.intgdc.com/job/compliance/job/gooddata-http-client-fossa-scanning-zuul-el7/36/ : SUCCESS in 1m 21s (non-voting)