setup.py: Remove flask-caching, flask deps
Not needed any more since the cache handling was replaced by
a drop-in imported solution in `isso/utils/cache.py`
@@ -6,7 +6,7 @@ from re import sub as re_sub
from setuptools import setup, find_packages
requires = ['itsdangerous', 'Jinja2', 'misaka>=2.0,<3.0', 'html5lib',
- 'werkzeug>=1.0', 'bleach', 'Flask-Caching>=1.9', 'Flask']
+ 'werkzeug>=1.0', 'bleach']
tests_require = ['pytest', 'pytest-cov']
# https://packaging.python.org/en/latest/guides/making-a-pypi-friendly-readme/
