Fix issue with six not getting installed.

We were doing it via installing *pytest* before,
which although worked was definitely not preferable
because it meant users would get pytest in their
prod environments.

Now we will do it by explicitly putting six in there.

Eventually we will remove python2 support and can remove six.

Author: UmanShahzad

requirements.in

@@ -1,7 +1,8 @@
-cachetools==2.1.0
-pip-tools==3.1.0
-pycodestyle==2.4.0
-pytest==3.8.2
-python-dateutil==2.6.1
-pytz==2017.2
+# For app
 requests>=2.18.4
+cachetools==3.1.1
+pytest==4.5.0
+
+# For dev
+pip-tools==3.7.0
+black==19.3b0

requirements.txt

@@ -2,23 +2,24 @@
 # This file is autogenerated by pip-compile
 # To update, run:
 #
-#    pip-compile --no-index --output-file requirements.txt requirements.in
+#    pip-compile --no-index --output-file=requirements.txt requirements.in
 #
+appdirs==1.4.3            # via black
 atomicwrites==1.3.0       # via pytest
-attrs==19.1.0             # via pytest
-cachetools==2.1.0
+attrs==19.1.0             # via black, pytest
+black==19.3b0
+cachetools==3.1.1
 certifi==2019.3.9         # via requests
 chardet==3.0.4            # via requests
-click==7.0                # via pip-tools
+click==7.0                # via black, pip-tools
 idna==2.8                 # via requests
 more-itertools==6.0.0     # via pytest
-pip-tools==3.1.0
+pip-tools==3.7.0
 pluggy==0.9.0             # via pytest
 py==1.8.0                 # via pytest
-pycodestyle==2.4.0
-pytest==3.8.2
-python-dateutil==2.6.1
-pytz==2017.2
+pytest==4.5.0
 requests==2.21.0
-six==1.12.0               # via pip-tools, pytest, python-dateutil
+six==1.12.0               # via pip-tools, pytest
+toml==0.10.0              # via black
 urllib3==1.24.1           # via requests
+wcwidth==0.1.7            # via pytest

setup.py

@@ -8,18 +8,17 @@
 You can visit our developer docs at https://ipinfo.io/developers.
 """
 
-setup(name='ipinfo',
-      version='1.1.1',
-      description='Official Python library for IPInfo',
-      long_description=long_description,
-      url='https://github.com/ipinfo/python',
-      author='James Timmins',
-      author_email='[email protected]',
-      license='Apache License 2.0',
-      packages=['ipinfo', 'ipinfo.cache'],
-      install_requires=[
-        'requests',
-        'cachetools',
-      ],
-      include_package_data=True,
-      zip_safe=False)
+setup(
+    name="ipinfo",
+    version="1.1.1",
+    description="Official Python library for IPInfo",
+    long_description=long_description,
+    url="https://github.com/ipinfo/python",
+    author="James Timmins",
+    author_email="[email protected]",
+    license="Apache License 2.0",
+    packages=["ipinfo", "ipinfo.cache"],
+    install_requires=["requests", "cachetools", "six"],
+    include_package_data=True,
+    zip_safe=False,
+)