NonlinearSolveQuasiNewton-v1.6.0

NonlinearSolveQuasiNewton NonlinearSolveQuasiNewton-v1.6.0

Diff since NonlinearSolveQuasiNewton-v1.5.0

Merged pull requests:

• Fix return codes for nonlinear least squares (#606) (@ChrisRackauckas)
• Bump to use SciMLBase ImmutableNonlinearProblem (#619) (@ChrisRackauckas)
• Continue on with the polyalg if a stalledsuccess (#622) (@ChrisRackauckas)
• Implement Adjoints for solution of IntervalNonlinearProblems (#623) (@jClugstor)
• Bump SciMLOperators v1 (#625) (@ChrisRackauckas)

Closed issues:

• NonlinearLeastSquaresProblem returns stalled (#459)
• Set of benchmarks to optimize AD? (#479)
• Release Checklist for v4 (#481)
• Muller algorithm benchmark (#582)
• Can't update packages that have JuliaSimCompiler in their dependencies (#617)