update go readme, update pom go dependencies (#274)

modules/openapi-generator/src/main/resources/go/README.mustache

@@ -5,7 +5,7 @@
 {{/appDescription}}
 
 ## Overview
-This API client was generated by the [swagger-codegen](https://github.com/swagger-api/swagger-codegen) project.  By using the [swagger-spec](https://github.com/swagger-api/swagger-spec) from a remote server, you can easily generate an API client.
+This API client was generated by the [openapi-generator](https://github.com/openapitools/openapi-generator) project.  By using the [OpenAPI-spec](https://www.openapis.org/) from a remote server, you can easily generate an API client.
 
 - API version: {{appVersion}}
 - Package version: {{packageVersion}}
@@ -18,6 +18,16 @@ For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}})
 {{/infoUrl}}
 
 ## Installation
+
+Install the following dependencies:
+```
+go get github.com/stretchr/testify/assert
+go get golang.org/x/oauth2
+go get golang.org/x/net/context
+go get gopkg.in/go-resty/resty.v0
+go get github.com/antihax/optional
+```
+
 Put the package under your project folder and add the following in import:
 ```golang
 import "./{{packageName}}"