update flask-login to 0.4.0

requirements.txt

@@ -25,7 +25,7 @@ et-xmlfile==1.0.1         # via openpyxl
 flask-assets==0.12        # via abilian-core
 flask-babel==0.11.1       # via abilian-core
 flask-debugtoolbar==0.10.0  # via abilian-core
-flask-login==0.3.2        # via abilian-core, flask-security
+flask-login==0.4.0        # via abilian-core, flask-security
 flask-mail==0.9.1         # via abilian-core, flask-security
 flask-migrate==2.0.2      # via abilian-core
 flask-principal==0.4.0    # via flask-security