v1.55.0

Added

• Introduce "period" ticklabelmode on cartesian date axes [#4993, #5055, #5060, #5065, #5088, #5089]
• Add new formatting options for weeks and quarters [#5026]
• Add source attribute to image traces for fast rendering [#5075]
• Add zsmooth attribute for discrete heatmapgl traces [#4953], with thanks to @ordiology for the contribution!
• Add horizontal and vertical markers for arrow charts [#5010]
• Add touch support to rangeslider [#5025], with thanks to @priyanomi, @cristiantx, @JasDev42 for their contribution!

Changed

• Improve contribution guide & readme, add code of conduct [#5068]
• Bump various dev-dependencies namely bubleify and glslify [#5084, #5085, #5118]

Fixed

• Fix updating title and tick labels during transition with react [#5045]
• Fix table wheel scroll for Firefox [#5051], with thanks to @ManelBH for the contribution!
• Fix ISO-8601 short time zone format [#5015], with thanks to @mtgto for the contribution!
• Fix numeric periods on date axes for bar with base [#5061]
• Fix bar and box widths on categorical axes in "overlay" mode [#5072]
• Fix symbol numbers in string format [#5073]
• Fix gl2d marker sizes [#5093]
• Fix default latitude span in geo subplots [#5033]
• Improve axis tick increment [#5114]