v3.1.0

• Add d3.scaleRadial.
• Add sequential.range (for compatibility with d3-axis).
• Fix log.ticks for small domains. #44
• Fix scale.clamp for sequential quantile scales. Thanks, @Fil!
• Fix scale.clamp for continuous scales with more domain values than range values.
• Fix diverging scales with descending domains. Thanks, @Fil!
• Adopt explicit paths for imports.