v0.2.0

Added

• feint version --check, which asks GitHub whether a newer release exists
  and prints the command to install it, pinned to that version. Asked for rather
  than volunteered: nothing reaches the network unless the flag is typed, and
  FEINT_NO_UPDATE_CHECK=1 refuses it outright. The binary never updates itself
  — telling beats rewriting something somebody verified.
• Brand files, in docs/assets/brand/, with docs/brand.md for what may be
  done with them. The wordmark is outlines rather than text, so the lockup
  renders the same on GitHub as in a slide, and the licence section states what
  the Apache licence does not cover: the name and the logo.