v0.4

What's Changed

• Don't show hess col when hess not available by @jessegrabowski in #52
• Move basinhopping.py into a module by @jessegrabowski in #54
• Sequential optimization by @jessegrabowski in #55
• Add support for differential evolution by @jessegrabowski in #56
• Improve progress bar metrics by @jessegrabowski in #53

Full Changelog: v0.3.2...v0.4