Updated Using Blendercam from github (markdown)

Using-Blendercam-from-github.md

@@ -10,7 +10,8 @@ The easiest way to install is not to install but tell Blender where to find the
 * [Updating Blendercam](#updating-blendercam)
 
 ## Dependencies
-* Blendercam requires Shapely to be installed to the site packages of Blender Python.
+* Blendercam requires Shapely and Numpy to be installed to the site packages of Blender Python (python3 !).
+`apt install python3-shapely python3-numpy cmake-gui`  
 
 ## Get Blendercam source code
 * The first step is to get the source code from the github repository.