v2.1.0

Release summary — changes since 2.0

• Zap — new toolbar button that closes duplicate tabs in the current window (exact and
  near-duplicates), keeping the first of each. Pinned tabs are left alone, and closed tabs can be
  restored with Ctrl+Shift+T.
• Explore a session — each saved session's ⋮ menu now has Explore ▾, which lists that session's
  tabs inline so you can open them one at a time instead of opening the whole session.