This release freezes the support of the old PHP versions.

• Open a given dba database
• Insert a new record with a given key (persistently or with a given expiration time)
• Get a record with a given key
• Replace the value of a record with a given key
• Delete the record with a given key
• Return metadata for the given key: expire timestamp & timestamp of last modification time
• Get all keys from cache
• Clean all entries
• Clean expired entries
• Flush the cache file
• Optimizes the database file automatically after cleaning process