v0.10.0

Added

• move Hessian inversion to Status and add hess field

Fixed

• use cargo-llvm-cov (messed up git history on previous attempt)
• use correct internal/external bounded/regular calls in all algorithms
• change finite difference delta

Other

• Merge pull request #31 from denehoffman/hotfixes
• change implementation of Hessian to use gradients
• fix link