v0.12.0

• new devices
  • hcsr04: Added HC-SR04 ultrasonic distance sensor. (#143)
  • spi/qspi: Low-level IO driver for serial flash memory via SPI and QSPI (#124)
  • tmp102: TMP102 low-power digital temperature sensor (#141)
  • amg88xx: AMG88xx thermal camera module
• bugfixes
  • mqtt: reduce use of goroutines in router to not start a new goroutine for each invocation of each callback