Update stream ID regex to support '('

[ghost]

According to Redis documentation, https://redis.io/topics/streams-intro, stream ID support a '(' prefix which causes the XRANGE command to be not inclusive.

[ghost]

Didn't look like there was a check for this anywhere because specs all still pass:

>bundle exec rspec
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Finished in 1 minute 53.62 seconds (files took 1.37 seconds to load)
1019 examples, 0 failures

[ghost]

Actually implemented the exclusive range and added tests

[sds]

Thank you!