Get environment variable by id
        ---
        serializer: EnvironmentVarSerializer
        responseMessages:
            - code: 401
              message: Not authenticated

def get(self, request, bot_id, id, format=None):
        """
        Get environment variable by id
        ---
        serializer: EnvironmentVarSerializer
        responseMessages:
            - code: 401
              message: Not authenticated
        """        
        return super(EnvironmentVarDetail, self).get(request, bot_id, id, format)