Versions (please complete the following information):

• NgxWebstorage: [e.g. 3.0.x]
• Angular: 9.0.0-rc.1

Describe the bug
I use Angular 9.0.0-rc.1 and get this warning, if I install ngx-webstorage:

`npm WARN [email protected] requires a peer of @angular/common@^8.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN [email protected] requires a

Chrome Version 49.0.2623.87 (64-bit) shows following error:
Failed to parse SourceMap: http://.../bower_components/angular-locker/dist/angular-locker.min.js.map
I think it's due to this line:
/*! angular-locker v2.0.4 | (c) 2016 @tymondesigns | https://github.com/tymondesigns/angular-locker */

It has come to our attention (through trial and error) that this package is no longer needed for users of Jest 24 or later. [email protected] ultimately includes jsdom, of which a recent version added localStorage and sessionStorage support out of the box.

I think it would be worth calling this out somewhere in the docs of `jest

As @vitaly-t mentioned in #41 the docs are not clear about what needs to be passed as the option pgPromise for this module. Also it will be worth mentioning that db.$pool from pg-promise can be used as of pg-promise 6.x for the pool option as me