Update readme with current `product-details` API #55

Job	Run time
Flake 8	14s
Python 3.7 + django22	14s
Python 3.7 + django32	17s
Python 3.8 + django22	16s
Python 3.8 + django32	16s
Python 3.8 + django40	14s
Python 3.9 + django22	17s
Python 3.9 + django32	17s
Python 3.9 + django40	18s
Python 3.10 + django32	18s
Python 3.10 + django40	18s
django-mozilla-product-details Release	0s
	2m 59s

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