gallium/docs: Update Gallium version number to 0.4.
diff --git a/src/gallium/docs/source/conf.py b/src/gallium/docs/source/conf.py
index 59c19ed..ccc8440 100644
--- a/src/gallium/docs/source/conf.py
+++ b/src/gallium/docs/source/conf.py
@@ -45,9 +45,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '0.3'
+version = '0.4'
 # The full version, including alpha/beta/rc tags.
-release = '0.3'
+release = '0.4'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.