added generator class to services metafile and tweak api doc template to handlebar format

Author: HugoMario

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

@@ -25,6 +25,7 @@ io.swagger.codegen.v3.generators.kotlin.KotlinServerCodegen
 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.scala.ScalaClientCodegen
 io.swagger.codegen.v3.generators.scala.AkkaHttpServerCodegen
 io.swagger.codegen.v3.generators.swift.Swift3Codegen

src/main/resources/handlebars/R/api_doc.mustache

@@ -17,18 +17,18 @@ Method | HTTP request | Description
 {{{notes}}}{{/notes}}
 
 ### Required Parameters
-{{^allParams}}This endpoint does not need any parameter.{{/allParams}}{{#allParams}}{{#-last}}
+{{^allParams}}This endpoint does not need any parameter.{{/allParams}}{{#allParams}}{{#@last}}
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------{{#authMethods}}
- **ctx** | **context.Context** | context containing the authentication | nil if no authentication{{/authMethods}}{{/-last}}{{/allParams}}{{#allParams}}{{#required}}
+ **ctx** | **context.Context** | context containing the authentication | nil if no authentication{{/authMethods}}{{/@last}}{{/allParams}}{{#allParams}}{{#required}}
   **{{paramName}}** | {{#isFile}}**{{dataType}}**{{/isFile}}{{#isPrimitiveType}}**{{dataType}}**{{/isPrimitiveType}}{{^isPrimitiveType}}{{^isFile}}[**{{dataType}}**]({{baseType}}.md){{/isFile}}{{/isPrimitiveType}}| {{description}} | {{#defaultValue}}[default to {{defaultValue}}]{{/defaultValue}}{{/required}}{{/allParams}}{{#hasOptionalParams}}
  **optional** | **map[string]interface{}** | optional parameters | nil if no parameters
 
 ### Optional Parameters
 Optional parameters are passed through a map[string]interface{}.
-{{#allParams}}{{#-last}}
+{{#allParams}}{{#@last}}
 Name | Type | Description  | Notes
-------------- | ------------- | ------------- | -------------{{/-last}}{{/allParams}}{{#allParams}}
+------------- | ------------- | ------------- | -------------{{/@last}}{{/allParams}}{{#allParams}}
  **{{paramName}}** | {{#isFile}}**{{dataType}}**{{/isFile}}{{#isPrimitiveType}}**{{dataType}}**{{/isPrimitiveType}}{{^isPrimitiveType}}{{^isFile}}[**{{dataType}}**]({{baseType}}.md){{/isFile}}{{/isPrimitiveType}}| {{description}} | {{#defaultValue}}[default to {{defaultValue}}]{{/defaultValue}}{{/allParams}}{{/hasOptionalParams}}
 
 ### Return type
@@ -37,7 +37,7 @@ Name | Type | Description  | Notes
 
 ### Authorization
 
-{{^authMethods}}No authorization required{{/authMethods}}{{#authMethods}}[{{{name}}}](../README.md#{{{name}}}){{^-last}}, {{/-last}}{{/authMethods}}
+{{^authMethods}}No authorization required{{/authMethods}}{{#authMethods}}[{{{name}}}](../README.md#{{{name}}}){{^@last}}, {{/@last}}{{/authMethods}}
 
 ### HTTP request headers