fixed templates errors

Author: HugoMario

src/main/resources/META-INF/services/io.swagger.codegen.v3.CodegenConfig

@@ -28,6 +28,7 @@ io.swagger.codegen.v3.generators.php.PhpClientCodegen
 io.swagger.codegen.v3.generators.python.PythonClientCodegen
 io.swagger.codegen.v3.generators.python.PythonFlaskConnexionCodegen
 io.swagger.codegen.v3.generators.r.RClientCodegen
+io.swagger.codegen.v3.generators.ruby.RubyClientCodegen
 io.swagger.codegen.v3.generators.scala.ScalaClientCodegen
 io.swagger.codegen.v3.generators.scala.AkkaHttpServerCodegen
 io.swagger.codegen.v3.generators.swift.Swift3Codegen