Fix animation when opening the Drawer

[vlazaroes]

Previously, width was used in animation, this caused strange animation when opening the Drawer.

This solution uses the property of margin and achieves smoother animation.

[manojVivek]

@vlazaroes This is wonderful, can you please resolve the merge conflicts?

[vlazaroes]

@manojVivek Solved.

[manojVivek]

@vlazaroes Great, thanks for making it better. Merging this in now, looking forward to more collaboration like this! 🙌

[manojVivek]

@all-contributors Please add @vlazaroes for code.

[allcontributors]

@manojVivek

I've put up a pull request to add @vlazaroes! 🎉

[manojVivek]

@vlazaroes Two things:

1. Can you let us know your Twitter handler? We would love to give a shout out for your work from our twitter handle.
2. Please join our community on Gitter - https://gitter.im/responsively-app/, for any discussions in the future.