Updated logos size.

README.rst

@@ -16,8 +16,9 @@ Main features:
 Sen2chain was developped in the frame of Sentinel-2 Malaria project, funded by CNES (TOSCA 2017-2019), under the coordination of Vincent Herbreteau (IRD - UMR Espace-Dev) and Christophe Révillion (Univ La Réunion - UMR Espace-Dev).
 
 .. image:: docs/source/logos.png
-    :width: 550 px
+    :width: 550px
     :height: 50px
+    :scale: 50 %
     :align: center
     :alt: logos