Improve requirements.txt

[maaaaz]

Hello @danieliu,

First, thank you for that great module.
Then, could you replace the == of the requirements.txt by >= ? Unless your module does not need these exact versions, I think it can be compatible with newer versions.

Cheers !

[danieliu]

Updated the install_requires in 17cc5a6.
Feel free to open a new issue if you encounter any problems.

[maaaaz]

Thanks @danieliu !