Fix an issue when cache intsance reference was nil in some cases

Merge pull request #194 from spring-media/feature/remove-object-from-…

…cache

Feature: Remove value from cache

Merge pull request #192 from spring-media/feature/fix-composed-cache-…

…receive-value-called-twice

Fix issue when composed cache receive value was called twice

Merge pull request #190 from spring-media/feature/get-rid-of-queue-as…

…suming-logic

Get rid of queue hopping

Merge pull request #189 from spring-media/feature/migrate-to-combine

Combine Migration

Merge pull request #188 from spring-media/bugfix/fix-embedded-piedpieper

Remove PiedPiper from embedded dependencies. Resolves #187

Merge pull request #185 from spring-media/feature/swift-package-manager

Swift Package Manager Support