Declare delayed_job and sidekiq as integration gem's dependency

[st0012]

No description provided.

[codecov-commenter]

Codecov Report

Merging #1506 (8b2ee54) into master (3d82d7f) will increase coverage by 0.56%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1506      +/-   ##
==========================================
+ Coverage   98.22%   98.78%   +0.56%     
==========================================
  Files         218      123      -95     
  Lines       10562     6725    -3837     
==========================================
- Hits        10374     6643    -3731     
+ Misses        188       82     -106     

Impacted Files	Coverage Δ
sentry-raven/spec/raven/client_spec.rb
sentry-raven/lib/raven/core_ext/object/deep_dup.rb
...ntry-raven/spec/raven/integrations/sidekiq_spec.rb
...c/raven/integrations/sidekiq/error_handler_spec.rb
sentry-raven/lib/raven/processor/http_headers.rb
sentry-raven/lib/raven/interfaces/stack_trace.rb
sentry-raven/lib/raven/transports.rb
sentry-raven/lib/raven/interfaces/exception.rb
...ven/spec/raven/processors/removestacktrace_spec.rb
...ntry-raven/lib/raven/helpers/deprecation_helper.rb
... and 85 more

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