Log Message:
tex-unicode-math{,-doc}: update to 0.8h

- v0.8g (2017/10/02)
  * Better use of scriptstyle sizes in LuaTeX (I think a regression).
  * Fix regression (`\mathbf` etc. not being set automatically) caused by
the renaming of a `fontspec` internal command.
  * Minor documentation improvements.

- v0.8h (2017/10/09)

  * Some bugs crept in in the last update due to some code rearrangement:
      * package version wasn't set;
      * some code was being executed at the wrong time;
      * `\sqrt[]{}` in LuaLaTeX gave incorrect output.
  * The layout of the code is now structured far more sensibly.
  * Remove (long deprecated) `\resetmathfont`; for years it has been a
synonym for `\setmathfont`.