add license-maven-plugin

[corgiboygsj]

No description provided.

[codecov]

Codecov Report

Merging #1667 (2d74085) into master (b5c4d1c) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1667   +/-   ##
=========================================
  Coverage     66.95%   66.95%           
- Complexity     7066     7067    +1     
=========================================
  Files           421      421           
  Lines         34673    34673           
  Branches       4802     4802           
=========================================
  Hits          23217    23217           
  Misses         9110     9110           
  Partials       2346     2346           

Impacted Files	Coverage Δ
...a/com/baidu/hugegraph/backend/query/Condition.java	79.42% <0.00%> (-0.37%)	⬇️
...c/main/java/com/baidu/hugegraph/task/HugeTask.java	72.30% <0.00%> (+0.30%)	⬆️

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