update .env.example (#794)

Author: asmogo

.env.example

@@ -89,7 +89,7 @@ MINT_LND_RPC_MACAROON="/path/to/admin.macaroon"
 MINT_LND_REST_ENDPOINT=https://127.0.0.1:8086
 MINT_LND_REST_CERT="/home/lnd/.lnd/tls.cert"
 MINT_LND_REST_MACAROON="/home/lnd/.lnd/data/chain/bitcoin/regtest/admin.macaroon"
-MINT_LND_REST_CERT_VERIFY=True
+MINT_LND_REST_CERT_VERIFY=TRUE
 
 # Use with CLNRestWallet
 MINT_CLNREST_URL=https://localhost:3010