preparing changelog for 1.8.0 #383

Job	Run time
mathcomp-single	41s
coq	40s
stdlib	41s
paramcoq	40s
coq-elpi	41s
bignums	41s
hierarchy-builder	1m 9s
mathcomp-ssreflect	2m 37s
mathcomp-fingroup	1m 44s
mathcomp-bigenough	1m 16s
deriving	1m 34s
mathcomp-finmap	1m 17s
reglang	1m 32s
mathcomp-algebra	3m 31s
coq-bits	1m 22s
fourcolor	12m 34s
mathcomp-classical	2m 32s
mathcomp-solvable	2m 24s
multinomials	1m 58s
mathcomp-reals	2m 57s
mathcomp-field	4m 6s
mathcomp-experimental-reals	1m 37s
mathcomp-reals-stdlib	1m 14s
mathcomp-real-closed	3m 35s
mathcomp-character	3m 48s
mathcomp-analysis	10m 48s
mathcomp	1m 31s
odd-order	8m 27s
mathcomp-analysis-stdlib	9m 26s
	1h 27m 3s

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