Upgrade version to 0.12.0 by Linary · Pull Request #1372 · apache/hugegraph

@@             Coverage Diff              @@
##             master    #1372      +/-   ##
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- Coverage     62.38%   62.37%   -0.02%     
- Complexity     5817     5828      +11     
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  Files           385      385              
  Lines         31922    31940      +18     
  Branches       4451     4458       +7     
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+ Hits          19916    19924       +8     
- Misses         9984     9995      +11     
+ Partials       2022     2021       -1