0.6.7 release

• fix #81, persistent I2C address (kudos to vslash)
• add void resetPOR() read back from non volatile RAM.
• add setConfiguration() // replaces setConfigure in 0.7.0
• add getConfiguration() // idem
• add magnetDetected() // replaces detectMagnet in 0.7.0
• add AS5600_MODE_RPS rounds / rotations per second mode
• fix AS5600_RAW_TO_RPM constant.
• remove "older experimental tags"
• update examples (configuration calls)
• update readme.md
• update unit tests
• update GitHub actions
• minor edits