UPD: update to the NonlinearExpr syntax of JuMP v1.15 #654

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - pull_request	11m 26s
Julia 1.6 - macOS-latest - x64 - pull_request	12m 30s
Julia 1.6 - windows-latest - x64 - pull_request	21m 59s
Julia 1 - ubuntu-latest - x64 - pull_request	7m 48s
Julia 1 - macOS-latest - x64 - pull_request	9m 40s
Julia 1 - windows-latest - x64 - pull_request	9m 1s
Julia nightly - ubuntu-latest - x64 - pull_request	11m 0s
Julia nightly - macOS-latest - x64 - pull_request	12m 35s
Julia nightly - windows-latest - x64 - pull_request	13m 25s
	1h 49m 24s

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