Log Message:
gtk-doc: update to 1.29.

GTK-Doc 1.29  (Aug 28 2018)
===============

GTK-Doc now requires python-3.X. It does not requires python-six anymore.

Note that this is a nonmaintainer release and that tests are known to be broken.

 Changes

 o 674163 :  –    html-build.stamp rule broken for \ 
out-of-tree builds with absolute paths
 o 795744 : Too much escaped string - "  & lt;child >  \ 
" in description of " GtkOverlay as GtkBuildable " \ 
section
 o 796011 : Crash in ScanDirectory caused by overlooked use of renamed `dir` variable
 o 796012 : Several places in rebase.py incorrectly use `match.groups(1)` \ 
instead of `match.group(1)`, one causes a crash

 Contributors

 Adam Williamson
 Anders Jonsson
 Daniel Mustieles
 David D
 LRN
 Marek Cernocky
 Martin Blanchard
 Michael Biebl
 Michael Catanzaro
 Rafael Fontenelle
 Sebastian Geiger
 Stefan Sauer
 Tim Sabsch