Merge pull request #233 from c0fec0de/214-rendertree-levelorderiter-e… #87

Job	Run time
build (3.7)	1m 24s
build (3.8)	1m 34s
build (3.9)	3m 35s
build (3.10)	1m 16s
build (3.11)	1m 7s
Indicate completion to coveralls.io	17s
publish	0s
	9m 13s

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