Update celluloid requirement from = 0.16.0 to = 0.17.4

[dependabot-preview]

Updates the requirements on celluloid to permit the latest version.

Changelog

Sourced from celluloid's changelog.

0.17.4 (2018-12-20)

• #773
  Fix the errant 'Couldn't cleanly terminate all actors in 10 seconds!' message
  after forking. Fixes "Couldn't cleanly terminate all actors in 10 seconds!" with Spring 1.6.0 and Rails 5.0.0.beta1 celluloid/celluloid#696.
  ([digitalextremist])

0.17.3 (2016-01-18)

• #701
  Conditions in loose threads loop does not take into account the difference between
  backtraces from ruby 2.0.0 and greater than. Fixes Celluloid::IO behaves like a Celluloid Actor failures celluloid/celluloid-io#165.
  ([TiagoCardoso1983])

• #700
  Set celluloid logger level to info by default unless debug is enabled. Fixes #667.
  ([ioquatix])

• #695
  Extending the condition event handler with the block; this solves a bug
  introduced in jruby >9.0.0.0, which breaks with an ArgumentError exception,
  apparently due to the way to_proc procs are passed arguments. Fixes #694.
  ([TiagoCardoso1983])

• #689
  Simplified sync, async and future proxies by providing specific AbstractCall base.
  ([ioquatix])

• #688
  Fix failure to remove dead actors from sets, e.g. celluloid-supervision.
  ([ioquatix])

• #686
  Print out method name to help debugging method call which caused dead actor error.
  ([ioquatix])

• #682
  Remove excess call/block require.

• #666
  Don't catch IOError.

0.17.2 (2015-09-30)

• Revamped test suite, using shared RSpec configuration layer provided by Celluloid itself.
• Updated gem dependencies provided by Celluloid::Sync... extraneous gems removed, or marked as development dependencies.
• Clean up deprecation notes.

0.17.1.2 (2015-08-21)

... (truncated)

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