Change name of event from boot to startup

Changes.md

@@ -10,7 +10,7 @@ Please see [Upgrading.md](Upgrading.md) for more comprehensive upgrade notes.
   after 6 months or 10,000 jobs.  The Web UI contains a "Dead" tab
   exposing these jobs.
 - **Process Lifecycle Events** - you can now register blocks to run at
-  certain points during the Sidekiq process lifecycle: boot, quiet and
+  certain points during the Sidekiq process lifecycle: startup, quiet and
   shutdown.
 - **Global Error Handlers** - blocks of code which handle errors that
   occur anywhere within Sidekiq, not just within middleware.

lib/sidekiq.rb

@@ -21,7 +21,7 @@ module Sidekiq
     :profile => false,
     :error_handlers => [],
     :lifecycle_events => {
-      :boot => [],
+      :startup => [],
       :quiet => [],
       :shutdown => [],
     },

lib/sidekiq/cli.rb

@@ -74,7 +74,7 @@ module Sidekiq
       logger.info "Running in #{RUBY_DESCRIPTION}"
       logger.info Sidekiq::LICENSE
 
-      fire_event(:boot)
+      fire_event(:startup)
 
       if !options[:daemon]
         logger.info 'Starting processing, hit Ctrl-C to stop'