What's Changed

• implement namespace by @mamantoha in #30
• breaking change underlying cache implementations must implement delete_impl and exists_impl methods instead of delete and exists? accordingly
• breaking change Added namespace property to Cache::Store. It can be used by underlying cache implementations for keys with namespace
• Logging delete method

Full Changelog: v0.13.0...v0.14.0

• Allow setting false as a value
• Fix MemoryStore and FileStore with generic types values
• Add Store#exists? to check if the cache contains an entry for the given key.
• Add Store#increment and Store#decrement for integer values in the cache.