Dispatcher is subject to change in RES 3.0

There will be no more possibility to pass a class to be instantiated.
Anything responding to a call will be a valid handler.
If you need old behavior define class method:

  ```
  class Handler
    def self.call(*)
      new.call(*)
    end

    def call(*)
    end
  end
  ```

Therefore the rspec tests are adjusted to the future design requirements

Co-authored-by: Szymon Fiedler <[email protected]>
Co-authored-by: Paweł Pacana <[email protected]>

ruby_event_store-rspec/spec/ruby_event_store/rspec/have_subscribed_to_events_spec.rb

@@ -12,7 +12,7 @@ module RSpec
             )
         )
       end
-      let(:handler) { Handler }
+      let(:handler) { Handler.new }
 
       def matcher(*expected)
         HaveSubscribedToEvents.new(*expected, differ: colorless_differ, phraser: phraser)

ruby_event_store-rspec/spec/ruby_event_store/rspec/matchers_spec.rb

@@ -19,9 +19,10 @@ module RSpec
         specify { expect(matchers.have_subscribed_to_events(FooEvent, BarEvent)).to be_an(HaveSubscribedToEvents) }
 
         specify do
-          event_store.subscribe(Handler, to: [FooEvent])
-          expect(Handler).to matchers.have_subscribed_to_events(FooEvent).in(event_store)
-          expect(Handler).not_to matchers.have_subscribed_to_events(BarEvent).in(event_store)
+          handler = Handler.new
+          event_store.subscribe(handler, to: [FooEvent])
+          expect(handler).to matchers.have_subscribed_to_events(FooEvent).in(event_store)
+          expect(handler).not_to matchers.have_subscribed_to_events(BarEvent).in(event_store)
         end
       end