Update readme-vars.yml

[dkaygithub]

fixes #29 in the case that the user is not running mongo v5

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• [ x] I have read the contributing guideline and understand that I have made the correct modifications

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Description:

It seems like this line has been changed and then reverted. I theorize that different people have gotten it to work based on the version of mongo that they use

Benefits of this PR and context:

#29 , #58, #24 are all examples of users being confused, hitting errors around this line

How Has This Been Tested?

tested on my intel NUC (unable to run mongo k)

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[wrgrant]

I'm using Mongo 4 and the one-liner version worked for me.

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