v1.22.0

Added

• Add cumulative histogram attributes to generate Cumulative Distribution
  Functions [#1189]
• Add standoff attribute for annotations to move the arrowhead away from the
  point it's marking [#1265]
• Add clicktoshow, xclick and yclick attributes for annotations to
  show/hide annotations on click [#1265]
• Support data-referenced annotation in gl2d subplots [#1301, #1319]
• Honor fixedrange: false in y-axes anchored to xaxis with range slider
  [#1261]
• Add fallbacks for IE9 so that all cartesian traces can render without any
  polyfill [#1297, #1299]

Changed

• Adapt plot schema output for plotly.py 2.0 [#1292]
• Bump mouse-change dep to ^1.4.0 [#1305]
• Improve performance in visible toggling for scattergl [#1300]

Fixed

• Fix XSS vulnerability in trace name on hover [#1307]
• Fix ternary and geo subplot with visible: false first trace [#1291]
• Fix opacity for mode: 'lines' items in legend [#1204]
• Fix legend items style for bar trace with marker arrays [#1289]
• Fix range slider svg / pdf and eps image exports [#1306]
• Fix scattergl visible: false traces with empty data arrays [#1300]
• Fix a few contour trace edge cases [#1309]
• Updatemenus buttons now render above sliders [#1302]
• Add fallback for categorical histogram on linear axes [#1284]
• Allow style fields in sub and sup text [#1288]