Missing modules in requirments.txt, and import error

[DarkLevelSecurity]

The solution is simple:

1. import telnetlib3 instead of telnetlib in the routersploit/core/exploit/shell.py because it's no longer standard module in python.
2. add two modules to the requirements.txt: setuptools and telnetlib3.

[h9zdev]

The solution is simple:

1. import `telnetlib3` instead of `telnetlib` in the `routersploit/core/exploit/shell.py` because it's no longer standard module in python.

2. add two modules to the requirements.txt: `setuptools` and `telnetlib3`.

#897 check this or you can pull latest repo