date-fns wrong dependency in package.json

[shemadolev]

Subject of the issue

date-fns should be in dependencies, otherwise apps won't start.

[BUG] Bug Reproduce Steps

1. Install react-date-range without installing date-fns.
2. Starting the app fails with an errors like:
   Module not found: Error: Can't resolve 'date-fns/max' in '[...]\node_modules\react-date-range\dist\components\Calendar'

[BUG] Expected behaviour

As this package uses date-fns (in Calendar for example), it should be a dependency and not a peerDependency, which will make npm installing this package also install the needed date-fns package.

Environment

Package Version: 1.4.0
React version: 17.0.2
Node version: 16.16.0

[shemadolev]

Note - I'm locally resolving this issue by adding on my package.json the dependency of date-fns.