Introduce require directive to load custom checkers

lib/database_consistency/configuration.rb

@@ -16,6 +16,8 @@ def initialize(file_paths = DEFAULT_PATH)
         end
         extract_configurations(existing_paths)
       end
+
+      load_custom_checkers
     end
 
     def debug?
@@ -123,5 +125,13 @@ def log_level
           settings && settings['log_level']
         end
     end
+
+    def load_custom_checkers
+      return unless configuration.key?('require') && configuration['require'].is_a?(Array)
+
+      configuration['require'].each do |path|
+        require path
+      end
+    end
   end
 end