Add missing mandatory selector in Deployment:apps/v1 spec

[prashanth-nani]

:wave: I did some ~awesome~ work for the Pelias project and would love for everyone to have a look at it and provide feedback.

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Here's the reason for this change :rocket:

• Connected to pelias/kubernetes#112

  Here's what actually got changed :clap:

  helm install --name pelias --namespace pelias ./ -f ./values.yaml It results into a successful release

[orangejulius]

Thanks! I took care of a couple additional things and merged this as part of #128