- Update to 0.18:
  * library API is now declared stable, ABI at soname 1.
    + include file is <tty.h> (not <vt100.h>)
    + identifier prefixes are tty_ not vt100_
  * asciicast support (v1 and v2).
  * .zst compression.
  * fetching (and not very useful putting) via CURL.
  * drop proxyrec.
  * tty emulation improvements:
    + CJK full(double)width
    + combining characters
    + overstrike (\e[9m)
    + 24-bit color
    + many ANSI codes
    + store the window title
  * license is now LGPL2+.
- Don't install libtty.a