cache_it 0.0.6

A simple object cache implementation

[0.0.6]

• Updated for null safety

[0.0.5]

• Updated add function to returned the cache value
• Added a new getOrUpdate function to combine getting and updating cache
• Changed default ttl to 10 minutes

[0.0.4]

• Fixed issue where returning entries would include null values
• Fixed issue with updating values with same keys
• Added toString methods to CacheEntry and CacheIt
• Added more unit tests

[0.0.3]

• Renamed package to cache_it to be less generic

[0.0.2]

• Added iterable to return cache entries.
• Renamed former entries to length for consistency.

[0.0.1]

• Initial cache implementation.