Updated additional packages requirements

README.rst

@@ -52,6 +52,12 @@ You might need to manually download dependencies. Mandatory dependencies:
 
     $ apt-get install build-essential devscripts dh-systemd fakeroot python-all python-docutils iproute2 python-ipaddr python-setuptools
 
+To build the deb file successfully, the following additional packages are required:
+
+.. code-block:: console
+
+    $ apt-get install dh-python python3-all python3-setuptools python3-docutils
+
 Suggested dependencies:
 
 .. code-block:: console