Projection of other observation #637

Job	Run time
conda install latest tensorflow (ubuntu-20.04)	4m 42s
Unit tests (ubuntu-20.04, 3.7)	16m 7s
conda install (ubuntu-20.04)	2m 47s
Build documentation	3m 50s
Unit tests (macos-11, 3.7)	35m 41s
Test uproot3 (ubuntu-20.04, 3.7)	16m 33s
Style checks	2m 29s
Unit tests (ubuntu-20.04, 3.6)	14m 23s
Unit tests (ubuntu-20.04, 3.8)	15m 8s
Coverage (ubuntu-20.04, 3.7)	13s
	1h 51m 53s

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