Tipp for your documentation: no changes in PubSubClient.h needed

[funtomaas]

Hi.
the documentation of PubSubclient says, you can use:
setBufferSize() to override MQTT_MAX_PACKET_SIZE.
So maybe you can easily change your Documentation and everybody can use the PubSubClient.lib & updates without changes,

PubSubClient::setBufferSize(512);` // to override MQTT_MAX_PACKET_SIZE (default = 256)

Cool work so far, thanx!