Fix .env.example

.env.example

@@ -5,7 +5,7 @@
 # Prisma supports the native connection string format for PostgreSQL, MySQL, SQLite, SQL Server, MongoDB and CockroachDB.
 # See the documentation for all the connection string options: https://pris.ly/d/connection-strings
 
-DATABASE_URL="prisma://localhost:8088?api_key=x5aol207TyRdhHuanAXlpTgVWDcK8jm2rVKJOQGbwaMqfvZbmGJnIbwBjUxYaBrFx1XOfyF4"  # arbitrary api key
+DATABASE_URL="./dev.db"
 CHAIN_DEFINITION_URL="file:./sample/chainDefinitions/goerli.json"
 AMQP_BROKER_URL="amqp://localhost"
 API_URL="http://localhost:8000"