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mention ttl and timeout unit (seconds) in README #835

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Run time

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Job	Run time
coverage	26s
rspec (2.7, sidekiq_7.0)	36s
rspec (2.7, sidekiq_7.1)	35s
rspec (2.7, sidekiq_7.2)	38s
rspec (2.7, sidekiq_7.3)	38s
rspec (3.0, sidekiq_7.0)	26s
rspec (3.0, sidekiq_7.1)	26s
rspec (3.0, sidekiq_7.2)	22s
rspec (3.0, sidekiq_7.3)	23s
rspec (3.1, sidekiq_7.0)	22s
rspec (3.1, sidekiq_7.1)	24s
rspec (3.1, sidekiq_7.2)	24s
rspec (3.1, sidekiq_7.3)	24s
rspec (3.2, sidekiq_7.0)	24s
rspec (3.2, sidekiq_7.1)	25s
rspec (3.2, sidekiq_7.2)	22s
rspec (3.2, sidekiq_7.3)	21s
rspec (3.3, sidekiq_7.0)	21s
rspec (3.3, sidekiq_7.1)	27s
rspec (3.3, sidekiq_7.2)	22s
rspec (3.3, sidekiq_7.3)	28s
	9m 14s