def renew(token, increment = 0, options = {})
      headers = extract_headers!(options)
      json = client.put("/v1/auth/token/renew", JSON.fast_generate(
        token: token,
        increment: increment,
      ), headers)
      return Secret.decode(json)
    end
def renew(token, increment = 0, options = {})
      headers = extract_headers!(options)
      json = client.put("/v1/auth/token/renew", JSON.fast_generate(
        token: token,
        increment: increment,
      ), headers)
      return Secret.decode(json)
    end
Renew the given authentication token.

 @example
   Vault.auth_token.renew("abcd-1234") #=> #<Vault::Secret lease_id="">

 @param [String] token
   the auth token
 @param [Fixnum] increment

 @return [Secret]