Update generic selection in Readme

update pack tool

Update package_ch55xduino_mcs51_index.json

Update package_ch55xduino_mcs51_index.json

Update package_ch55xduino_mcs51_index.json

Update package_ch55xduino_mcs51_index.json

Update package_ch55xduino_mcs51_index.json

Update package_ch55xduino_mcs51_index.json

update to 0.0.3

Update README.md