Update get command on README file for verifying that deployment is successful

[iomv]

Amending command that was filtering by a wrong app name

What this PR does / why we need it: This is to fix the instructions on how to verify that deployment was successful. Currently it shows no resources because it is filtering by the wrong app name.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: iomv
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[coveralls]

Coverage remained the same at 39.702% when pulling 77f5ed1 on iomv:patch-1 into 2f700a9 on kubernetes:master.