explicitly require Flask-Login==0.2.11
explicitly require Flask-Login==0.2.11

Flask-Security uses is_authenticated as a function in its latest
release (fixed by
https://github.com/mattupstate/flask-security/commit/7e8551763eb6f3cdff1622d41be2b2d855655b92
but not yet released).

This commit makes sure Flask-Security and Flask-Login are compatible.

wooyek/flask-social-blueprint,wooyek/flask-social-blueprint