Remove "version" annotations from du and prune commands

These annotations were picked up by the YAML docs generator, and shows up as
"minimum API version". I couldn't find a reference to these annotations in the
PR that added them, so thought it would be ok to remove

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

commands/diskusage.go

@@ -109,7 +109,6 @@ func duCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 			options.builder = rootOpts.builder
 			return runDiskUsage(dockerCli, options)
 		},
-		Annotations: map[string]string{"version": "1.00"},
 	}
 
 	flags := cmd.Flags()

commands/prune.go

@@ -135,7 +135,6 @@ func pruneCmd(dockerCli command.Cli, rootOpts *rootOptions) *cobra.Command {
 			options.builder = rootOpts.builder
 			return runPrune(dockerCli, options)
 		},
-		Annotations: map[string]string{"version": "1.00"},
 	}
 
 	flags := cmd.Flags()