Comparation of different way for identical particles #646

Job	Run time
conda install latest tensorflow (ubuntu-20.04)	3m 57s
Build documentation	2m 11s
Unit tests (ubuntu-20.04, 3.7)	15m 54s
conda install (ubuntu-20.04)	2m 38s
Unit tests (macos-11, 3.7)	36m 38s
Test uproot3 (ubuntu-20.04, 3.7)	16m 5s
Style checks	2m 11s
Unit tests (ubuntu-20.04, 3.6)	14m 31s
Unit tests (ubuntu-20.04, 3.8)	15m 29s
Coverage (ubuntu-20.04, 3.7)	36s
	1h 50m 10s

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