Upgraded commons-codec from 1.11 to 1.15

[freemanjp]

To fix: https://security.snyk.io/vuln/SNYK-JAVA-COMMONSCODEC-561518

[codecov]

Codecov Report

Merging #227 (ab5308a) into master (4dd29fd) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##              master      #227   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       136       136           
===========================================
  Files             70        70           
  Lines            589       589           
  Branches          33        33           
===========================================
  Hits             589       589           

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