1.7.3 release
fix #55, redo #53 (#56) - fix #55 ==> redo fix #53 - add test to detect **MBED** and **RP2040** - adjust **I2C_BUFFERSIZE** for RP2040 to 128. - update readme.md
fix #55, redo #53 (#56) - fix #55 ==> redo fix #53 - add test to detect **MBED** and **RP2040** - adjust **I2C_BUFFERSIZE** for RP2040 to 128. - update readme.md