Upgrading NativeBase reference (and potentially theme files?)

Hi all

First of all: Thanks for this project - it helped me a lot to get started with RN :)

Quick question: I've seen that you are bootstrapping quite a few custom files for the theme (the `variables` and `components` folders). At the time I setup my project, you were bootstrapping the project to install NativeBase 2.3.3, with the most current version being 2.3.5. Is there anything I need to consider before upgrading NativeBase in order not to break anything now or further down the line?