1.10.2 (2022-04-25)

This release adds security/responsible disclosure guidelines and fixes a few
issues with input validation in the 'chafa' command-line tool.

* Added disclosure guidelines in SECURITY.md (suggested by Jamie Slome).

* Bug fixes:
  huntr.dev  Null pointer dereference in libnsgif with crafted GIF file
             (reported by @JieyongMa).
  [unfiled]  File magic would not effectively rule out internal loaders.
  [unfiled]  Very big images could cause absurd allocation requests triggering
             an abort in the loader.