Replace boolean with bool - IridiumSBD::isConnected()

[niag-IDSI]

I compiled with PlatformIO (still Arduino platform) and got a warning that boolean is deprecated.

Perhaps makes sense to replace with bool in the IridiumSBD::isConnected() function

[PaulZC]

Hello @niag-IDSI ,

Apologies for the very slow reply!

This is resolved in v3.0.6.

Very best wishes,
Paul