EnviroDIY/YosemitechModbus: v0.2.2: Better Y532 pH support, updated manuals & software

The EnviroDIY YosemitechModbus library enables the use of an Arduino board as a master to control and communicate with the sensors produced by Yosemitech via Modbus RTU over RS-485. This library requires the use of the EnviroDIY/SensorModbusMaster library. New features, improvements and bug fixes for v0.2.2: Better Y532 pH support, updated manuals & software include: Fix to Y532 pH startMeasurement return, which is required to get Y532 pH to work as a stand-alone sensor in ModularSensors. Commit https://github.com/EnviroDIY/YosemitechModbus/commit/574a31ce8a3755ce501438fd46fbc67808124c1b. Updates to Windows software utilities and documentation ModbusRunner v2.5.1.5 MulitSensor v1.9 Updates to YosemiTech manuals Updates to calibration spreadsheets & protocols. Issues #14, #16