v1.3.0

Changed the way constant exports are handled by default:

• Previously named constant exports (e.g. export const foo = 'bar') were ignored by default. While default constant exports (e.g. export default foo) were treated similar to other immutable values like literals, globals and imports.
• Now the behavior is consistent for both named and default exports: the exported values are rewired, but the original variables are left intact. Constants cannot be rewired within the module unless unsafeConst option is used.

Thanks to @sergei-startsev for most of the work.