some mistake in jinjia2ext.py

[lpdswing]

line33:
from flask.ext.cache import make_template_fragment_key should change to from flask_cache import make_template_fragment_key

Otherwise, there will be an error in flask 1.0.2

[agoldgeier]

Also experiencing this - weird that this package currently breaks itself

[voidus]

This is fixed in #192

[tabris17]

this project seems to be deprecated. mybe you should use flask-caching instead

[zxmrlc]

This is fixed in #192

it also has some mistake in flask