remove retrofit codegen from config

Author: cbornet

README.md

@@ -203,7 +203,6 @@ PhpClientCodegen.java
 Python3ClientCodegen.java
 PythonClientCodegen.java
 Qt5CPPGenerator.java
-RetrofitClientCodegen.java
 RubyClientCodegen.java
 ScalaClientCodegen.java
 ScalatraServerCodegen.java

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

@@ -13,7 +13,6 @@ io.swagger.codegen.languages.PhpClientCodegen
 io.swagger.codegen.languages.PythonClientCodegen
 io.swagger.codegen.languages.Python3ClientCodegen
 io.swagger.codegen.languages.Qt5CPPGenerator
-io.swagger.codegen.languages.RetrofitClientCodegen
 io.swagger.codegen.languages.RubyClientCodegen
 io.swagger.codegen.languages.ScalaClientCodegen
 io.swagger.codegen.languages.ScalatraServerCodegen