remove io.jenkins.plugins.echarts-api as dependency management

[simonsymhoven]

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[codecov]

Codecov Report

Merging #218 (5b9606e) into master (baf1e9f) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #218   +/-   ##
=========================================
  Coverage     79.03%   79.03%           
  Complexity        5        5           
=========================================
  Files             2        2           
  Lines            62       62           
  Branches         10       10           
=========================================
  Hits             49       49           
  Misses            7        7           
  Partials          6        6           

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