Merge pull request #1181 from bartekbsh/dont-verify-logger

Remove explicit `Logger` class verification

lib/ddtrace/configuration/settings.rb

@@ -96,7 +96,6 @@ class Settings
 
       settings :logger do
         option :instance do |o|
-          o.setter { |value, old_value| value.is_a?(::Logger) ? value : old_value }
           o.on_set { |value| set_option(:level, value.level) unless value.nil? }
         end
 

spec/ddtrace/configuration/settings_spec.rb

@@ -301,7 +301,14 @@
     end
 
     describe '#instance=' do
-      let(:logger) { Datadog::Logger.new(STDOUT) }
+      let(:logger) do
+        double(:logger,
+               debug: true,
+               info: true,
+               warn: true,
+               error: true,
+               level: true)
+      end
 
       it 'updates the #instance setting' do
         expect { settings.logger.instance = logger }