timeToLive documentation fix

[nhomble]

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Expected Behavior

In the library docs, timeToLive in the message publisher states

    /** The number of seconds for the message to buffer on the broker, awaiting correlation. Omit or set to zero for no buffering. */
    timeToLive: MaybeTimeDuration;

so I was expecting the argument to be optional (and defaulted to 0)

Current Behavior

There is a ts-compiler error because the argument is required.

Possible Solution

Add a ?