[Release] Update index.json for extension [ image-copy ]

[Azure CLI Bot (azclibot)]

[Release] Update index.json for extension [ image-copy ]

Triggered by Azure CLI Extensions Release Pipeline - ADO_BUILD_ID=359998

Last commit against master: c6506f9

[Azure Builder (azuresdkci)]

If this PR is for a new extension or change to an existing extension, use the following to try out the changes in this PR:

docker run -it microsoft/azure-cli:latest
export EXT=<NAME>
pip install --upgrade --target ~/.azure/cliextensions/$EXT "git+https://github.com/azclibot/azure-cli-extensions.git@release-20200417-073450#subdirectory=src/$EXT&egg=$EXT"

[Yong Zhang (yonzhan)]

add to S169

[Yunge Zhu (yungezz)]

hi Feiyue Yu (@qwordy) could you pls check the release? thanks

[Feiyue Yu (qwordy)]

Can we wait for this PR: #1560