Feature Request: 3.3V compatibility

[santaimpersonator]

Just a future consideration for the shield. Utilize the IOREF/AREF pins to make the shield compatible with our 3.3V boards:

• RedBoard Artemis
• IoT RedBoard - ESP32
• RedBoard Turbo - SAMD21

Currently, the windvane direction is pulled up to 5V. This causes issues when a 3.3V ADC tries to read that pin (reading is maxed out). (*I didn't look into the annemometer and rain gauge pins, but I assume that utilizing IOREF would be optimal for those pins as well.)