Bump version from 0.7.4 to 0.8.0 #181

Job	Run time
setup_matrix	2m 6s
break (NLPModelsIpopt, latest)	48s
break (Percival, latest)	49s
break (Percival, stable)	49s
break (RegularizedOptimization, stable)	2m 40s
break (NLPModelsTest, latest)	48s
break (NLPModelsIpopt, stable)	50s
break (RipQP, latest)	57s
break (QuadraticModels, stable)	46s
break (FletcherPenaltySolver, stable)	2m 47s
break (NLPModelsKnitro, stable)	54s
break (JSOSolvers, latest)	44s
break (JSOSolvers, stable)	45s
break (LLSModels, stable)	47s
break (JSOSuite, stable)	3m 17s
break (JSOSuite, latest)	3m 17s
break (QuadraticModels, latest)	44s
break (FletcherPenaltySolver, latest)	2m 41s
break (NLPModelsTest, stable)	45s
break (PartiallySeparableNLPModels, latest)	3m 46s
break (RipQP, stable)	59s
break (RegularizedOptimization, latest)	2m 36s
break (LLSModels, latest)	43s
break (PartiallySeparableNLPModels, stable)	5m 0s
break (NLPModelsKnitro, latest)	56s
upload	9s
	41m 23s

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