Missing minute directive in second.rb cache_key

[Ganesh Bonala]

In Second#cache_key method, minute directive is missing. This caused some incorrect cache hits when run in same second of same hour.

Current: [super, Time.now.strftime('%Y-%m-%dT%H:%S')].join(':')

Correct: [super, Time.now.strftime('%Y-%m-%dT%H:%M:%S')].join(':')

[Dean Galvin]

Just as a heads up, I am working on this!