Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.
• If the code introduces new aliases, I provide a valid use case for all plugin users down below.

Changes:

Brings kube-ps1 up-to-date with current master. In particular, this adds the KUBE_PS1_HIDE_IF_NOCONTEXT feature I needed. This is literally a copy/paste of https://github.com/jonmosco/kube-ps1/blob/f412a4bc807f733a18cdeca39eee906d82910302/kube-ps1.sh

Other comments:

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