ImportError: No module named builtwith

[digglepress]

root@young:~# git clone https://github.com/ultrasecurity/webkiller.git
Cloning into 'webkiller'...
remote: Enumerating objects: 54, done.
remote: Total 54 (delta 0), reused 0 (delta 0), pack-reused 54
Unpacking objects: 100% (54/54), done.
root@young:~# cd webkiller
root@young:~/webkiller# pip install -r requirements.txt
Requirement already satisfied: colorama in /usr/lib/python3/dist-packages (from -r requirements.txt (line 1)) (0.3.7)
Requirement already satisfied: requests in /usr/local/lib/python3.6/dist-packages (from -r requirements.txt (line 2)) (2.18.1)
Collecting builtwith (from -r requirements.txt (line 3))
Downloading https://files.pythonhosted.org/packages/9b/b8/4a320be83bb3c9c1b3ac3f9469a5d66e02918e20d226aa97a3e86bddd130/builtwith-1.3.3.tar.gz
Requirement already satisfied: idna<2.6,>=2.5 in /usr/local/lib/python3.6/dist-packages (from requests->-r requirements.txt (line 2)) (2.5)
Requirement already satisfied: certifi>=2017.4.17 in /usr/lib/python3/dist-packages (from requests->-r requirements.txt (line 2)) (2018.8.24)
Requirement already satisfied: urllib3<1.22,>=1.21.1 in /usr/local/lib/python3.6/dist-packages (from requests->-r requirements.txt (line 2)) (1.21.1)
Requirement already satisfied: chardet<3.1.0,>=3.0.2 in /usr/lib/python3/dist-packages (from requests->-r requirements.txt (line 2)) (3.0.4)
Requirement already satisfied: six in /usr/lib/python3/dist-packages (from builtwith->-r requirements.txt (line 3)) (1.11.0)
Building wheels for collected packages: builtwith
Running setup.py bdist_wheel for builtwith ... done
Stored in directory: /root/.cache/pip/wheels/2b/00/c2/a96241e7fe520e75093898bf926764a924873e0304f10b2524
Successfully built builtwith
Installing collected packages: builtwith
Successfully installed builtwith-1.3.3
root@young:~/webkiller# python webkiller.py
Traceback (most recent call last):
File "webkiller.py", line 9, in
import builtwith
ImportError: No module named builtwith