2.0.0 `readBusVoltage` now in Volts + new helper methods

 New features

• New helper methods to match INA219 class interface:

  float getBusVoltage_V(void);
  float getShuntVoltage_mV(void);
  float getCurrent_mA(void);
  float getPower_mW(void);

⚠️ Warning ⚠️

The unit for readBusVoltage has changed from millivolts to Volts in this release. [See this commit: 7d89e31]

☝️ Warning 👆

Full Changelog: 1.1.0...2.0.0