Fix issue with PIP 10

[m0ngr31]

No description provided.

[m0ngr31]

Trying to install this with pip 10 breaks:

➜ pip install flask-ask               
Collecting flask-ask
  Downloading https://files.pythonhosted.org/packages/6a/f5/d4709ae94584a0b1541e9b52b2d25a8a1bdb6e2da9d6870f23fdd0523a30/Flask-Ask-0.9.8.tar.gz (40kB)
    100% |████████████████████████████████| 40kB 803kB/s 
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-install-QejwnA/flask-ask/setup.py", line 8, in <module>
        from pip.req import parse_requirements
    ImportError: No module named req
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-QejwnA/flask-ask/

[pmespresso]

LGTM. https://stackoverflow.com/questions/25192794/no-module-named-pip-req for reference

[samjiks]

👍