Add MongoDB and "info" and helm3 for metrics-server

Changelog for 0.7.9:

• PR #165 Add app for MongoDB (review / rebase from Prateek's PR) by @alexellis

• PR #164 apps: add crossplane by @hasheddan

• PR #162 Fix Travis badge by @braybaut

• Add "info" and helm3 for metrics-server

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Extract helm download commands to public package

Changelog for 0.7.8:

Extract helm download code to public package

This allows code re-use with other systems and projects.

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Move to apps to their own package

Changelog for 0.7.7:

• PR #159 Move to apps to their own package by @alexellis

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Fix regression in k3sup version info

Changelog for 0.7.6:

• PR #153 Add set flag by @prateekgogia

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Set exit code to non-zero upon error

Changelog for 0.7.5:

• PR #151 Wrap command execution with global error check by @burtonr
• PR #150 include istio app in Readme by @prateekgogia

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Add --set for istio app

Changelog for 0.7.4:

• Add --set which I believe will be crucial for any users to
  customise the options they want
• Allow skip of init chart via --init=false

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Migrate to Go modules

Changelog for 0.7.3:

• PR #145 Migrate to Go modules by @alexellis

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Add Istio app

Changelog for 0.7.2:

• PR #141 Add Istio app by @alexellis
• PR #144 add helm3 flag to inlets operator command by @prateekgogia
• PR #142 Adds --set flag to openfaas command by @prateekgogia
• PR #143 README: k3sup-multipass by @matti
• PR #137 Add app info subcommand by @karuppiah7890

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Update go-execute

Changelog for 0.7.1:

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Expose getClientArch

Changelog for 0.7.0:

• PR #135 Upgrade to k3s v1.0.1 by @Waterdrips
• PR #129 Add readme info on the currently supported Apps by @Waterdrips
• PR #130 Fix chart app creating namespace even if exists by @Waterdrips

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