[aur-general] merge request, some python packages to python2

[Ward De Ridder]

Can you please merge:

* python-flask-principal [1] ==> python2-flask-principal [2]
* python-flask-sqlalchemy [3] ==> python2-flask-sqlalchemy [4]
* python-speaklater [5] ==> python2-speaklater [6]

Thanks!
Ward

[1] https://aur.archlinux.org/packages/python-flask-principal/
[2] https://aur.archlinux.org/packages/python2-flask-principal/

[3] https://aur.archlinux.org/packages/python-flask-sqlalchemy/
[4] https://aur.archlinux.org/packages/python-flask-sqlalchemy/

[5] https://aur.archlinux.org/packages/python2-speaklater/
[6] https://aur.archlinux.org/packages/python-speaklater/