Cython not required

[buffer]

While taking a look at setup.py and requirements.txt I realized that they are not correctly defined.
Cython should be used just for generating pylibinjection.c so the following lines

sourcefiles = [
    'src/pylibinjection.pyx',
    'submodules/libinjection/c/libinjection_sqli.c'
]

should be

sourcefiles = [
    'src/pylibinjection.c',
    'submodules/libinjection/c/libinjection_sqli.c'
]

and the user is not required to install Cython at all. Please take a look at pylibemu setup.py for an example. In such case I temporarly decomment the lines and set sourcefiles to the .pyx just for producing the .c file. That avoids the end user installing Cython. If needed I can produce a patch for it.