Prioritize hash in connection parameter detection

[tagliala]

Allow to detect hashes responding to #call, like ActiveSupport::OrderedOptions

This will enable out of the box compatibility with
Rails.application.config_for method and should not break existing
use cases, because ConnectionPool and RedisClient do not inherit
from Hash

Close #152

[tagliala]

rspec ./spec/client_spec.rb:122 # Redlock::Client lock when lock is available when redis connection error occurs fails to acquire a lock if majority of Redis instances are not available

Is failure related to this change?

Also, I can see an issue with coveralls

[Coveralls] Submitting to https://coveralls.io/api/v1
Coveralls encountered an exception:
OpenSSL::SSL::SSLError

[leandromoreira]

rspec ./spec/client_spec.rb:122 # Redlock::Client lock when lock is available when redis connection error occurs fails to acquire a lock if majority of Redis instances are not available

Is failure related to this change?

I believe so

Also, I can see an issue with coveralls

I don't think that's blocking PR error-like.

[Coveralls] Submitting to https://coveralls.io/api/v1
Coveralls encountered an exception:
OpenSSL::SSL::SSLError

[tagliala]

I can also work on coveralls integration in a separate PR, I manage to maintain coveralls ruby reborn which is not required for GitHub actions