Reset the SDA and SCL pins to INPUT at Wire.end() to prevent multiple pins...

Reset the SDA and SCL pins to INPUT at Wire.end() to prevent multiple pins connected to I2C when changing pins (#302)

libraries/Wire/src/Wire.cpp

@@ -181,6 +181,8 @@ void TwoWire::end() {
         return;
     }
     i2c_deinit(_i2c);
+    pinMode(_sda, INPUT);
+    pinMode(_scl, INPUT);
     _running = false;
     _txBegun = false;
 }