Cache the _stats function

[IP1102]

Closes #295

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.39%. Comparing base (b44153b) to head (861eee1). Report is 5 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   97.38%   97.39%           
=======================================
  Files          18       18           
  Lines        1146     1150    +4     
=======================================
+ Hits         1116     1120    +4     
  Misses         30       30           

Files with missing lines	Coverage Δ
pydriller/domain/commit.py	97.30% <100.00%> (+0.02%)	:arrow_up:

[testpulseio[bot]]

TestPulse report

Test execution

:partying_face: Congrats, all your tests have passed! See all builds of the PR: https://app.testpulse.io/oss/ishepard/pydriller/builds/pr/305

Files without coverage

:warning: Some files changed in the PR are not covered by tests, careful!

• pydriller/domain/commit.py

Coverage information

No changes in coverage, nice! :tada:

[ishepard]

Thanks for the PR!