No longer in need for a ⚠️ here

Only those who bundles kaminari-core without bundling kaminari-actionview, kaminari-sinatra, or kaminari-grape would see this warning today,
but that's a rare case, and that should be intentional.

kaminari-core/lib/kaminari/core.rb

@@ -8,22 +8,6 @@ rescue LoadError
   #do nothing
 end
 
-$stderr.puts <<-EOC if !defined?(::Rails::Railtie) && !defined?(Sinatra) && !defined?(Grape)
-warning: no framework detected.
-
-Your Gemfile might not be configured properly.
----- e.g. ----
-Rails:
-    gem 'kaminari'
-
-Sinatra/Padrino:
-    gem 'kaminari-sinatra'
-
-Grape:
-    gem 'kaminari-grape'
-
-EOC
-
 # load Kaminari components
 require 'kaminari/config'
 require 'kaminari/exceptions'