ENH: update release note

RELEASE_NOTES.txt

@@ -2,12 +2,17 @@ OTB-v.3.6.0 - Changes since version 3.4.0 (2010/??/??)
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 * Applications
+ * otbFastOrthoRectif
+ * otbActiveLearning
+ * otbCompareImages
+ * otbFineRegistration
+ * Old GUI applications removed (now in Monteverdi):  OrthoRectif, OrthoFusion, Classif, ChangeDetection, RadiometricCorrections
 
 * Library
   * Some classes are marked as deprecated and are available for one release. A migration guide to help the transition is available at http://wiki.orfeo-toolbox.org/index.php/Migration_guide
 
 * System
-
+ * Internal ITK updated to 3.20.0 + OTB Patches
 
 OTB-v.3.4.0 - Changes since version 3.2.0 (2010/06/30)
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