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Add sponsors section to readme (#378) #1046

Job	Run time
Python 3.9 testing with elasticsearch7	1m 51s
Python 3.9 testing with opensearch	1m 48s
Python 3.9 testing with elasticsearch8	1m 55s
Python 3.10 testing with elasticsearch7	1m 47s
Python 3.12 testing with elasticsearch7	1m 53s
Python 3.10 testing with opensearch	1m 47s
Python 3.11 testing with opensearch	2m 17s
Python 3.12 testing with elasticsearch8	1m 53s
Python 3.13 testing with elasticsearch7	1m 46s
Python 3.12 testing with opensearch	1m 55s
Python 3.13 testing with elasticsearch8	1m 56s
Python 3.13 testing with opensearch	1m 51s
Python 3.11 testing with elasticsearch7	2m 13s
Python 3.11 testing with elasticsearch8	2m 14s
Python 3.10 testing with elasticsearch8	2m 3s
	29m 9s

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