Update gspell to 1.4.2

News in 1.4.2, 2017-08-19
-------------------------
* GspellEntry: make the code that navigates through PangoLogAttr's more robust.
* Translation updates.

News in 1.4.1, 2017-04-09
-------------------------
* GspellEntry: do not emit the GtkEditable::changed signal.
* Replace some g_asserts by g_returns to avoid crashes (bug #778883).
* Translation updates.

News in 1.4.0, 2017-03-18
-------------------------
* Translation updates.
* Other small improvements.

News in 1.3.3, 2017-02-26
-------------------------
This is an unstable release in the 1.3 development cycle. The 1.4 stable
version will be released at the same time as GNOME 3.24.

* Add more assertions for:
  https://bugzilla.gnome.org/show_bug.cgi?id=778883
* Fix minor issues found by Coverity.
* Translation update.

News in 1.2.3, 2017-02-24
-------------------------
* Replace a g_assert_cmpint() by a g_return_if_fail(), to avoid a crash. The
  assertion sometimes fails, probably because of a bug in a lower-level
  library.
  https://bugzilla.gnome.org/show_bug.cgi?id=778883

News in 1.3.2, 2017-01-15
-------------------------
This is an unstable release in the 1.3 development cycle. The 1.4 stable
version will be released at the same time as GNOME 3.24.

* GspellEntry: do not check the word currently typed.
* GspellEntry: better word boundaries, take into account apostrophes and
  dashes.
* GspellEntry: disable inline spell checking if the GtkEntry is in password
  mode.
* Various other improvements.
* Translation updates.

(prlw1)