v0.9.10

Pluto v0.9.10

Diff since v0.9.9

Closed issues:

• Occasional Hide a Cell Error (#138)
• Local files in HTML output (#171)
• Wrong Hyperlink in error for "Multiple expressions in one cell." (#176)
• Amazing project. Meta-issue (#180)
• Add "undo" for deleting one or several cells (#184)
• Allow different maths font (#187)