README.md: Remove OpenCollective as no funds are needed nor given #2

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Job	Run time
test (8.2)	14s
test (8.1)	17s
test (8.0)	2m 25s
test (7.4)	20s
test (7.3)	14s
test (7.2)	15s
test (7.1)	19s
	4m 4s