v0.5.2

• Add delay calculating utilities (#128)
• Expand API for window functions to allow zero-phase windows (#240)
• Expand API for remez (#242)
• Bug fixes (#191, #205, #214, #215)
• Performance improvements (#215, #218, #223)
• Documentation improvements (#205, #225, #229, #239, #240, #244)
• Remove unused code (#246)