Update Dependencies.md

Dependencies.md

@@ -29,6 +29,9 @@ This is a modified version of [DBoW2](https://github.com/dorian3d/DBoW2) and [DL
 * All code in **g2o** folder.
 This is a modified version of [g2o](https://github.com/RainerKuemmerle/g2o). All files included are BSD licensed.
 
+* All code in **Sophus** folder.
+This is a modified version of [Sophus](https://github.com/strasdat/Sophus). [MIT license](https://en.wikipedia.org/wiki/MIT_License).
+
 #####Library dependencies 
 
 * **Pangolin (visualization and user interface)**.