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This change allows the pins to be used for I2C to be configured. When using a real Arduino you don't want to do this, but if using the CAP1188 with something like an ESP8266 it is useful to be able to configure the pins.
As the constructor is already overloaded, I added a method setI2CPins(int i2cclock, int i2cdata). If you don't call this method, then it uses the default for Wire (SCL and SDA). If you do call this method, then it uses the pins you specified when configuring Wire.