fix(Store): deprecate projector selector

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ngrx/platform/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

Deprecates the overload that will be removed in #1579

[coveralls]

Coverage decreased (-0.1%) to 89.43% when pulling 5a411ff on pr/deprecate-selector into 5fbcb3c on master.

[ngrxbot]

Preview docs changes for 5a411ff at https://previews.ngrx.io/pr1580-5a411ff/