v0.8.0

Added

• add L-BFGS-B algorithm
• update line search to take a max_step optional argument and return a bool flag of validity rather than an Option
• add LineSearch trait and implementations of BFGS and L-BFGS algorithms
• update NelderMead to count gradient evals and use bounded interface
• add bounded evaluation shortcuts to Function trait and count gradient evaluations in Status

Fixed

• simplify logic by removing internal m
• change to inequality to ensure a proper status message if the max iterations are passed

Other

• fix brackets in readme and update main lib docs
• update readme
• remove unused collections module