Add Open API version number to root client

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Add Open API version number to root client

Sometimes, developers specify the version used in the application. It’s also useful to add a request header like X-API-Version: 1.0.0.

API Spec

{
  "openapi": "3.0.0",
  "info": {
    "version": "1.0.0"
  }
}

Usage

final client = RestClient(dio);

// 1.0.0
print(RestClient.version);

client.someApi.getRequest(
  extras: { 
    'custom-header': { 
      'X-API-Version': '${RestClient.version}' 
    }
  }
);