fix 0 score bug and pip 10 requirements (#5)

* fix 0 score bug and pip 10 requirements

* calculate score for both topic and posts using same function.

setup.py

@@ -1,7 +1,10 @@
 import io  # for python2
 from os import path
 from setuptools import setup
-from pip.req import parse_requirements
+try:  # for pip >= 10
+    from pip._internal.req import parse_requirements
+except ImportError:  # for pip <= 9.0.3
+    from pip.req import parse_requirements
 from version import __version__ as version
 
 WORKING_DIR = path.abspath(path.dirname(__file__))
@@ -11,7 +14,8 @@ with io.open(path.join(WORKING_DIR, 'README.rst'), encoding='utf-8') as f:
     long_description = f.read()
 
 # read requirements.txt and load into list
-REQUIREMENTS_TXT = parse_requirements(path.join(WORKING_DIR, "requirements.txt"), session='my_session')
+REQUIREMENTS_TXT = parse_requirements(
+    path.join(WORKING_DIR, "requirements.txt"), session='my_session')
 REQUIREMENTS = [str(r.req) for r in REQUIREMENTS_TXT]
 
 setup(
@@ -21,7 +25,7 @@ setup(
     entry_points={
         'console_scripts': [
             'rfd = rfd.rfd_cli:cli',
-            ],
+        ],
     },
     install_requires=REQUIREMENTS,
     keywords='cli redflagdeals',