Log Message:
Update to 0.4.0

Changelog:
GEGL-0.4.0 2018-04-26

GEGL 0.4.x is a stable release series of GEGL to have a stable API
and ABI to go with GIMP-2.10. When the need arises to break API or
ABI compatibility the 0.4.x series will get its own branch and
unstable API experiments and development, 0.5.x will happen in
master. For now though master will track the 0.4.x series.  Core

Change GeglParamSpecSeed from int to uint to match the value range
of GeglRandom's seed.  Operations

ripple fixed remaining issues needed to remove legacy GIMP plug-in
in GIMP. spherize, requrise transform and color-overlay moved out
of workshop. ppm-load ported to GIO.

Contributors to this release: Ell, Piotr Drąg, Anders Mortensen,
Anders Jonsson, Marco Ciampa, Daniel Korostil, Øyvind Kolås, Jon
Nordby and Simon Budig.