v3.8.1

[3.8.1] - 2019-04-19

Updated

• Updated Plotly.js to version 1.47.3. See the plotly.js CHANGELOG for more information.

Fixed

• Fix MathJax rendering in Firefox (plotly/plotly.js#3783)
• Fix vertical responsive resizing in exported HTML files (#1524, 1525)

Changed

• Reverted change to layout.legend.itemsizing = 'constant' in built-in templates
  that was made in 3.8.0. This resulted in unexpectedly large legend entries in
  some common cases (#1526)