update README for v2020.06.20

Merge remote-tracking branch 'upstream/master'

update defconfig for v2020.05.10

add default config for v2020.04.29

update default config for v2020.04.26

Merge branch 'master' of https://github.com/xiaoqingfengATGH/HomeLede

add default config for v2020.04.12

Merge branch 'master' of https://github.com/xiaoqingfengATGH/HomeLede

update defconfig for v2020.04.04

update default config