prompter 1.2.0

• Fix use with echarts4r. Using add_prompt() made plots very narrow (#5).
• Add documentation on how to have same options for all tooltips.
• Add documentation on how to add a tooltip on a single icon, and how to have
  line breaks in the text.
• Update hint.css to 3.0.0:
  • New size value "fit" that makes the tooltip be as large as the element
    to which it is attached.
  • The default font size is slightly smaller (1rem).
  • When rounded = TRUE, the tip of the arrow is rounded too.

prompter 1.1.0

• Fix "permanent" option (#2)
• Update hint.css to 2.7.0
• Add "arrow" and "shadow" options

prompter 1.0.0

• First version