Remove 'private' keyword

RuboCop said that this instance of 'private' was a 'useless access modifier'

lib/kitchen/driver/aws/client.rb

@@ -87,6 +87,12 @@ def self.get_credentials(profile_name, access_key_id, secret_access_key, session
         end
         # rubocop:enable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity
 
+        def self.get_shared_creds(profile_name)
+          ::Aws::SharedCredentials.new(:profile_name => profile_name)
+        rescue ::Aws::Errors::NoSuchProfileError
+          false
+        end
+
         def create_instance(options)
           resource.create_instances(options)[0]
         end
@@ -112,14 +118,6 @@ def resource
           @resource ||= ::Aws::EC2::Resource.new
         end
 
-        private
-
-        def self.get_shared_creds(profile_name)
-          ::Aws::SharedCredentials.new(:profile_name => profile_name)
-        rescue ::Aws::Errors::NoSuchProfileError
-          false
-        end
-
       end
 
     end