v3.15.0

Commits

• [a1c9723]: Update URL for Soitora's dark theme (#66) (Soitora) #66
• [2c700f2]: Bump acorn from 6.4.0 to 6.4.1 (#64) (dependabot[bot]) #64
• [74b12cc]: Don't use Node.js 8.x for CI (Simon Alling)
• [0533d9d]: Fix vulnerabilities (Simon Alling)
• [5a75fc2]: Fix incorrect indentation (Simon Alling)
• [1b29d38]: Add draft mode toggle (Simon Alling)
• [ad1ddfe]: Simplify autosave draft logic (Simon Alling)
• [a48bc07]: Consider signature edit mode as edit mode (Simon Alling)
• [094f045]: Fix incorrectly positioned preferences link (Simon Alling)
• [5863a22]: Automatically deploy builds to GitHub Pages (Simon Alling)