[gimp-web/testing] content: add gradient tool news in 2.10.0-RC2 post.

[Jehan Pagès <jehanp src gnome org>]

commit ebedf305d421f9f5b807d06ab7723b78eb1e3ef5
Author: Jehan <jehan girinstud io>
Date:   Mon Apr 16 11:00:32 2018 +0200

    content: add gradient tool news in 2.10.0-RC2 post.

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 .../2018-04-14_GIMP_2.10_RC2_Released/index.md     |   16 +++++++++++++++-
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diff --git a/content/news/2018-04-14_GIMP_2.10_RC2_Released/index.md 
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@@ -56,8 +56,22 @@ person stays around for maintenance).
 
 [Ville Pätsi]: http://shadowdrama.net/
 
+## Gradient tool improved to work in linear color space
 
-### New on-canvas control for 3D rotation
+The gradient tool can now work in linear color space, thus making sure you have way more even transitions.
+
+<figure>
+<img src="{attach}gradient-tool-linear.jpg" alt="Gradient tool in linear space" width="1260" height="788">
+<figcaption>
+Gradient tool in perceptual and linear spaces
+</figcaption>
+</figure>
+
+We also used the opportunity to rename the tool, which used to be called
+"Blend tool" until now, even though nobody uses such name. "Gradient
+tool" is a much more understandable naming.
+
+## New on-canvas control for 3D rotation
 
 A new widget for on-canvas interaction of 3D rotation (yaw, pitch, roll)
 has been implemented by Ell. This new widget is currently only used for