Pyfcm

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- Added extra_kwargs for dinamic vars in notify_single_device/notify_multiple_devices functions

.. _Sergey Afonin: https://github.com/safonin

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- Checking content-length in response.headers, otherwise it will crash, when calling response.json()

.. _Rishabh : https://gihub.com/elpoisterio

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- Added support for sending data only messages

.. _Emmanuel Adegbite: https://github.com/olucurious

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- Fixed xrange issue in python3

.. _Emmanuel Adegbite: https://github.com/olucurious

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- Fixed python 3 import issue

.. _MrLucasCardoso: https://github.com/MrLucasCardoso

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- Fixed "registration_id of notify_single_device does not work with a str input"

.. _Emmanuel Adegbite: https://github.com/olucurious