v1.5.6

• Fix a bug that shows duplicated entries
• Change Mustache engine (Hogan.js -> mustache.js)
  • Hogan.js is no longer maintained
  • Hogan.js uses the eval-ish features that have caused extension permissions related issues.
    • That could be bigger issue when migrating to Manifest v3
  • mustache.js is highly compatible, small and fast enough
• Other minor improvements