Lying is not permitted.
Merge pull request #10 from locriani/fix-the-lies

Lying is not permitted.
Make README a bit more clear.
Duplicate params before returning them.
No need to create a module, the singleton suffices.
Memoize the parameters.

No need to keep calling `permit!`.
Add additional clarity to README. [ci skip]
Minor README tweak. [ci skip]