updated for version 3.8.0

NEWS

+version 3.8.0
+-------------
+
+ New features and user visible changes:
+
+  * Delete dialog: make the delete button red
+
+ Bugs fixed:
+
+  * build error when JPEG_LIB_VERSION < 80 (!44)
+
 version 3.7.2
 -------------
 

meson.build

 project('gthumb', ['c', 'cpp'],
   license : 'GPL2+',
-  version : '3.7.2',
+  version : '3.8.0',
   meson_version : '>=0.42.1'
 )