Update LICENSE file with the year of last update

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Codecov Report

Merging #1100 (ddaa529) into master (c1ca3f1) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1100   +/-   ##
=========================================
  Coverage     83.11%   83.11%           
  Complexity     2615     2615           
=========================================
  Files           346      346           
  Lines          6705     6705           
  Branches        482      482           
=========================================
  Hits           5573     5573           
  Misses          934      934           
  Partials        198      198           

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Build succeeded (gate pipeline).

• https://checklist.intgdc.com/job/compliance/job/gooddata-java-merge-compliance-check/273/ : SUCCESS in 19s
• https://checklist.intgdc.com/job/compliance/job/gooddata-java-fossa-scanning-zuul-el7/112/ : FAILURE in 1m 54s (non-voting)