warnings when running Rails test suite (instance variable not initialized)

[bronson]

Seeing a lot of these when running the Rails 5 beta 2 tests:

/Users/bronson/.gem/ruby/2.2.2/gems/em-hiredis-0.3.1/lib/em-hiredis/base_client.rb:231: warning: instance variable @inactivity_timer not initialized
/Users/bronson/.gem/ruby/2.2.2/gems/em-hiredis-0.3.1/lib/em-hiredis/base_client.rb:236: warning: instance variable @inactivity_trigger_secs not initialized

Easy workaround appears to be to put @inactivity_timer = @inactivity_trigger_secs = nil in BaseClient's initializer. Can submit a PR for that if you want.

[bronson]

test output: https://gist.github.com/bronson/2ab1261feef531c4fca3