Dependency Update

[efraespada]

Hi, I'm using this package and npm alerts me the lodash package (a dependency of unset) contains vulnerabilities:

Versions of lodash before 4.17.5 are vulnerable to prototype pollution.
The vulnerable functions are defaultsDeep, merge, and mergeWith which allow a malicious user to modify the prototype of Object via __proto__ causing the addition or modification of an existing property that will exist on all objects.

Could you update it?

Thanks!!