Error installing using pip #5

We use:

pip install https://codeload.github.com/iki/unidecode/legacy.zip/master

And this is producing this error:

Downloading/unpacking https://codeload.github.com/iki/unidecode/legacy.zip/master
Downloading master (230kB): 230kB downloaded
Running setup.py egg_info for package from https://codeload.github.com/iki/unidecode/legacy.zip/master
Traceback (most recent call last):
File "", line 16, in
File "/tmp/pip-esUArV-build/setup.py", line 62
url = 'https://github.com/iki/unidecode/'
SyntaxError: keyword argument repeated
Complete output from command python setup.py egg_info:
Traceback (most recent call last):

File "", line 16, in

File "/tmp/pip-esUArV-build/setup.py", line 62

url = 'https://github.com/iki/unidecode/'

SyntaxError: keyword argument repeated

Cleaning up...
Command python setup.py egg_info failed with error code 1 in /tmp/pip-esUArV-build
Storing complete log in /root/.pip/pip.log