Add -H|--human flag to docker history

Add a flag to print sizes and dates in human readable format.

Signed-off-by: Arnaud Porterie <arnaud.porterie@docker.com>
Upstream-commit: f00c5d0720
Component: cli

components/cli/docs/sources/reference/commandline/cli.md

@@ -1222,6 +1222,7 @@ This will create a new Bash session in the container `ubuntu_bash`.
 
     Show the history of an image
 
+      -H, --human=true     Print sizes and dates in human readable format
       --no-trunc=false     Don't truncate output
       -q, --quiet=false    Only show numeric IDs