Listing messages accepts conversationId instead of contactId

[lorenzosani]

messagebird-nodejs/types/index.d.ts

Line 240 in 2d8b7de

contactId: string,

When calling MessageBird.conversations.listMessages, the call doesn't work if a contactId is passed, but works when the conversationId is passed. I believe this behaviour is correct, but the parameter name should be changed from contactId to conversationId if this is the case