v0.15.0

Mind maps in replies are drawn as pictures where the terminal draws images (mermaid-render v0.5.0): the tree on two sides of the root, a colour per branch, every node shape, labels wrapped as mermaid wraps them. A label with emphasis, an icon in its text or math shows the source with a note. Fixed: an ER or state label with emphasis the previous rule missed (snake_case) shows the source instead of a picture with the underscores. See CHANGELOG.md.