Version 1.1.0

This release includes several updates to support v2 of the modem firmware:

• Corrects the way the checksums are checked in checkUnsolicitedMsg
• Corrects the serial receive timeout for ESP32 (to compensate for the way Serial.available works on ESP32)
• Corrects a small gremlin in setMessageNotifications
• Updates the GPIO1 pin modes for v2
• Adds readGPIO1voltage
  • Only valid for modes 1 and 2 (SWARM_M138_GPIO1_ADC and SWARM_M138_GPIO1_INPUT)
  • If the pin is in mode 2 (digital input SWARM_M138_GPIO1_INPUT), the voltage returns as 0.0 or 3.3
• Adds getCPUvoltage
• Removes listTxMessagesIDs - the $MT L=U command option was removed in v2 _{Shame... I liked that option!}
• Adds listMessage
• Corrects sleepUntil when sleeping to a date (and time)
• Extends the message hold duration from 1 year to 13 months

Version v1.0.0

First release after testing on an M138 modem with v1.5.0-rc4 firmware