Release 2.1.0

[chyunsu3]

The new release will incorporate the following changes:

• Work around a compiler bug in GCC 7 #302
• Fix errors reported by Python linter #312
• [CI] Upgrade to CentOS 7 + GCC 8 #313
• Improve vector leaf performance #311
• Handle the case where left_categories={} #303
• Use JSON serializer to enable model introspection #296
• Fix NativeLibLoader on Java 9+ #315

[codecov]

Codecov Report

Merging #316 (d1ff0f8) into mainline (936a085) will decrease coverage by 0.89%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             mainline     #316      +/-   ##
==============================================
- Coverage       85.19%   84.29%   -0.90%     
  Complexity         43       43              
==============================================
  Files             108      108              
  Lines            8240     8210      -30     
  Branches          469      469              
==============================================
- Hits             7020     6921      -99     
- Misses           1196     1265      +69     
  Partials           24       24              

Impacted Files	Coverage Δ
python/treelite/contrib/msvc.py	0.00% <0.00%> (-67.15%)	⬇️
python/treelite/libpath.py	67.85% <0.00%> (-14.29%)	⬇️
runtime/python/treelite_runtime/libpath.py	67.85% <0.00%> (-14.29%)	⬇️
python/treelite/contrib/__init__.py	69.67% <0.00%> (-5.74%)	⬇️
python/treelite/contrib/util.py	86.17% <0.00%> (-4.26%)	⬇️
python/treelite/core.py	78.57% <0.00%> (-3.58%)	⬇️
runtime/python/treelite_runtime/util.py	92.10% <0.00%> (-2.64%)	⬇️
runtime/python/treelite_runtime/predictor.py	84.74% <0.00%> (-1.13%)	⬇️
python/treelite/sklearn/common.py	94.11% <0.00%> (-1.13%)	⬇️
python/treelite/sklearn/gbm_regressor.py	92.85% <0.00%> (-0.90%)	⬇️
... and 6 more

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