Add UMAMI: Umami on Arbitrum

[keepsense]

• I understand that token listing is not required to use the SushiSwap Interface with a token.
• I understand that filing an issue or adding liquidity does not guarantee addition to the Sushi default token list.
• I will not ping the Discord about this listing request.

Please provide the following information for your token.

Network:
Token Address (checkSum): 0x1622bf67e6e5747b81866fe0b85178a93c7f86e3
Token Name (from contract): Umami
Token Decimals (from contract): 9
Token Symbol (from contract): UMAMI
SushiSwap V2 Pair Address of Token: https://app.sushi.com/analytics/pairs/0xebfc40b1ac6907673b33ddc370f868dc21cd5b2b

Link to sushiswap/assets PR: sushiswap/assets#362
Link to the official homepage of token: https://app.umami.finance/
Link to CoinMarketCap or CoinGecko page of token: https://www.coingecko.com/en/coins/umami-finance
Link to official Twitter account: https://twitter.com/UmamiFinance

[jiro-ono]

Added