chore: update example env variables

* latest dss-vest address
* latest keeper registry address
* correct payment token variable name
* actual network name

Author: imollov

.env.example

@@ -3,12 +3,12 @@ MAINNET_URL=https://eth-mainnet.alchemyapi.io/v2/<YOUR ALCHEMY KEY>
 KOVAN_URL=https://eth-kovan.alchemyapi.io/v2/<YOUR ALCHEMY KEY>
 PRIVATE_KEY=0xabc123abc123abc123abc123abc123abc123abc123abc123abc123abc123abc1
 SEQUENCER='0x9566eB72e47E3E20643C0b1dfbEe04Da5c7E4732'
-NETWORK_NAME='LINK'
-DSS_VEST='0x0fC8D4f2151453ca0cA56f07359049c8f07997Bd'
+NETWORK_NAME='CHAINLINK'
+DSS_VEST='0xa4c22f0e25C6630B2017979AcF1f865e94695C4b'
 DAI_JOIN='0x9759a6ac90977b93b58547b4a71c78317f391a28'
 VOW='0xa950524441892a31ebddf91d3ceefa04bf454466'
-DAI_TOKEN='0x6B175474E89094C44Da98b954EedeAC495271d0F'
-KEEPER_REGISTRY='0x7b3EC232b08BD7b4b3305BE0C044D907B2DF960B'
+PAYMENT_TOKEN='0x6B175474E89094C44Da98b954EedeAC495271d0F'
+KEEPER_REGISTRY='0x02777053d6764996e594c3E88AF1D58D5363a2e6'
 SWAP_ROUTER='0xE592427A0AEce92De3Edee1F18E0157C05861564'
 LINK_TOKEN='0x514910771AF9Ca656af840dff83E8264EcF986CA'
 PAYMENT_USD_PRICE_FEED='0xAed0c38402a5d19df6E4c03F4E2DceD6e29c1ee9'