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Upgrading from 0.3.* to 0.4.0

Thanks for upgrading!

Before checking the list of changes, this visualization might be enough.

spring() now has its signature changed from spring(value, [stiffness, damping]) to spring(value, {stiffness: ..., damping: ..., precision: ...}). If you used e.g. spring(10, presets.gentle), this stays the same (presets has been changed to use objects instead so no refactoring needed).
Motion's style now only takes values intended to be interpolated. Previously it allowed you to pass {x: spring(0), y: 'randomUnrelatedStuffHere'}. This is now disallowed. Simply pass them to the component you're styling in your children function.
Same applies for StaggeredMotion and TransitionMotion. The latter is a bit tricky, since you might have wanted to carry around the extra data of the unmounted style configuration. Fortunately, TransitionMotion's whole API got a revamp and made this use-case cleaner. See the README for more info.
The TransitionMotion API changes from using styles object to styles array, thus making reorderKeys unnecessary. It's now removed.
Subtle change: strengthened the defaultStyle/defaultStyles/willEnter format. No longer allowed to pass spring() configs in these since these are starting values and the configs only applied to destination values (style/styles/willLeave).
React-Native build is now gone since RN v0.18+ uses the vanilla NPM React.
Miscellaneous perf improvements, type friendliness, bug fixes.