update README.md
update README.md

add onPermissionDenied
AppCanOpenSource/appcan-docs-v2,pingping-jiang6141/appcan-docs-v2,sandy1108/appcan-docs-v2,AppCanOpenSource/appcan-docs-v2,sandy1108/appcan-docs-v2,pingping-jiang6141/appcan-docs-v2,pingping-jiang6141/appcan-docs-v2,AppCanOpenSource/appcan-docs-v2,AppCanOpenSource/appcan-docs-v2,pingping-jiang6141/appcan-docs-v2,sandy1108/appcan-docs-v2,sandy1108/appcan-docs-v2